Abstract
On account of their unique shape memory effect (SME), pseudoelasticity, and biomedical applications, shape memory alloys (SMAs) have gained significant acceptance in the industrial trade and biomedical applications over the past few decades. Due to their affordable constituent parts and the availability of large-scale methods that are commonly employed for the manufacturing of stainless steels, Fe-based shape memory alloys offer benefits in commercial production, owing to their low cost compared to NiTi. The increasing insistence on stronger, lighter, and more functional materials paved the way for active materials. SMAs are a distinct grade of active materials. They exhibit attractive attributes like the potential to provide considerable recoverable strain while mechanical loading (superelasticity), shape recovery during heating (shape memory effect), and biocompatibility, which ultimately prove them to be one of the appropriate actuators for applications in the biomedical industry. This paper gives a review of the Martensitic transformation of some of the compositions of Fe-based SMAs, their potential to be used in civil structures as strengthening materials, their applications, and future research needs. This paper also focuses on the application of iron-based SMAs in different fields and the necessity to work on this SMA in the future since results show that Fe-based SMAs have shown good potential and can serve as an apt alternative to Ni-based shape memory alloys, which on the other hand has quite a lot of disadvantages, the key one being costly. Fe-based SMAs are comparatively lower in cost and have a greater scope to work with in the near future.
Introduction
Shape Memory Alloys (often called SMA) are a group of metal alloys that have the ability to “remember” their original form. When the metals are twisted or disturbed from their initial shape, they have the ability to come back to their original form when deformed due to external factors such as magnetic field, heat, or stress. The reversible phase transition that SMAs go through, known as the martensitic transformation, causes the SME. Changes in the action of forces or temperature can cause the martensitic transition. The martensitic transformation, also known as forward transformation, occurs when the austenite phase (high-temperature phase) is cooled which is when the martensite phase appears (low-temperature phase). The widely used applications of shape memory alloys are that connectors for hydraulic tubing in airplanes, heat engines, active vibration control of structures, orthodontic wires, and automatic switches in home devices. Because of the interesting shape memory property, they have found applications in biomedical implants (stents, heart valve tools), Dentistry (orthodontics), MEMS, sensors, actuators, and antennae. Fe-based SMAs, particularly Fe–Mn–Si alloys, exhibit a lot of potential in civil engineering applications, although they are still in the early stages of development. So far, the research done on Fe-based SMAs year-wise, source-wise, and country-wise has been depicted in Figs. 1, 2, and 3 respectively. Figure 4a, b represents the shape memory effect and superelasticity in shape memory alloys. Recent advancements in alloy combination and manufacture pave the way for new applications, particularly in the field of fixing and building new constructions, when these SMAs are used as prestressing tendons. These might also serve as a suitable replacement for Ni-based shape memory alloys which are currently being utilized in several fields. Figure 5 gives a brief outlook on shape memory alloy, their properties, and applications.
a Picture depicting shape memory effect and superelasticity. b Stress strain temperature diagram and crystal lattices (Porentaa et al. 2021) (Reused from Elsevier under the Creative Commons CC-BY licence)
Few alloy combinations have effectively been investigated and created until now, for example, Ni–Ti–Zr, Ni–Mn, and Ni–Ti–Pd. Some functional issues actually stay inexplicable in the above alloy combinations. For example, Ni–Al composites are viewed as temperamental; Ni–Ti–Zr and Ni–Mn amalgams are considered to be excessively fragile. This urged us to work on an alternative. A new market for Fe-based SMAs was gradually explored in the 2000s. This market included commodities for which Ni–Ti alloys are fruitless as production components. Large-diameter connecting pipelines for tunnel establishment and crane rail joint bars (fishplates) are the most recent examples that have aided the Fe-based SMAs in breaking into this new industry. In fact, the Fe–Mn–Si SMAs have inherited many of the structural properties associated with stainless steel. Fe–SMAs behavior in corrosive environments (Lee et al. 2016; Michels et al. 2018; Hosseini et al. 2019a) as well as its long-term sturdiness and consistency (Ke et al. 2023; Lee et al. 2013; Felice et al. 2023; Ghafoori et al. 2019; **e et al. 2024) have already been studied and have given positive results. As a result, the Fe–Mn–Si SMAs would fit into the market for structural materials with the function of SME (Fig. 6).
Graph indicating the stress and recoverable strain of materials (Kanayo et al. 2016). The iron-based alloy referred here is Fe–28Ni–17Co–11.5Al–2.5Ta–0.05B (at.%); (reused with permission from Elsevier)
Martensitic transformation
SMAs undergo a martensitic change in the forward phase. In general, they undergo a solid-state diffusion-less transformation in which atoms travel in a regular pattern in relation to their surroundings. The parent phase is sheared uniformly, yielding a new crystal structure that has no changes in composition. Although the relative positions of atoms vary negligibly, the movement of atoms as a group can cause severe macroscopic deformations. A temperature shift, such as mechanical distortion or quenching can both cause the martensitic transition. A martensitic transformation that is induced mechanically occurs not just in shape memory alloys, but also in stainless steel, carbon steel, and a variety of other alloys. For instance, in the automotive industry, steels with high Mn (15–30% mass) are employed. They provide high strength and resistance to crashes for the body parts of the automobile because of their excellent ductility (with failure strains from 80 to 90%) and reasonably elevated ultimate strengths. The amount of Mn in these steels has a big impact on how they behave. As per the crystal structure, the typical Martensitic transformation in Fe-based alloys can be divided into two phases: transitions from the parent (FCC) to the martensite (BCC, BCT, or FCT) and transformations from parent to martensite (HCP). Fe–Mn–Si is by far the most exhaustively researched Fe-based SMA (Sato et al. 1982; Roca et al. 2017). Apart from the shape memory effect, Fe–Mn–Si has excellent fatigue performance and is used as a seismic dampening component (Sawaguchi et al. 2016). The transition, however, is non-thermoelastic, thus not possible to attain superelasticity. It was reported that thermoelastic transformation can occur when a matrix is sufficiently reinforced and the BCT structure’s tetragonality is sufficiently high (Maki et al. 1984; Maki n.d.). The transformation of the Fe–Ni–Co–Ti alloy to thermoelastic occurs because of the coherence of the phase’s precipitation with the γ matrix (Maki et al. 1984). However, due to the brittleness generated by precipitation of grain boundary, it was previously not easy to achieve superelasticity at normal temperature (room temperature). This was solved by maintaining the character distribution of the grain boundary under control. Researchers have found the feasibility of superelasticity at normal temperature (room temperature) in Fe–Ni–Co–Al–Ta–B alloy in 2010 (Tanaka et al. 2010), and later the same property was found in its family of alloys, like Fe–Ni–Co–Al–Nb–B and Fe–Ni–Co–Al–Ti–B (Omori et al. 2013; Chumlyakov et al. 2016; Lee et al. 2014). In this work, the grain boundary energy was decreased with a strong recrystallization texture achieved through appropriate cold-rolling and annealing the result of which precipitation of the grain boundary was successfully inhibited. As a result, thin sheets can achieve a substantial super elastic strain of up to 13.5%; however, the brittleness of the wires remains because of the difficulties in attaining the low-energy grain boundary. In these alloy systems, γ parent phase’s transformations to the martensitic phase are responsible for the characteristics of shape memory alloy. Fe–Mn–Al–Ni, a novel ferrous SMA was discovered in 2011 (Qiang et al. 2022). The crystal structures are portrayed in Fig. 7a and its superelasticity is portrayed in Fig. 7b. The microstructure of this alloy is comparable to that of Fe–Ni–Co-based SMAs.
Furthermore, precipitates that are nanosized and coherent developed in a disordered matrix with an ordered structure proves vital in thermoelastic martensitic transition, despite the fact that the α (bcc) “ferrite” phase, transforms martensitically to γ(fcc) “austenite” phase, in contrast traditional Fe-based SMAs with γ parent phase. In the Fe–Mn–Ga system (Omori et al. 2009; Zhu et al. 2009), a comparable Martensitic transformation from the to the has been observed. The Fe–Mn–Al–Ni alloy can solve a problem in alloys that are superelastic, which has large stress sensitivity to temperature for martensitic transformation and consequently small temperature window for superelasticity, as an add-on to the merits of the cheap ingredients and appreciable ability towards cold working. Until now, superelasticity in Fe–Mn–Al–Ni alloy has been achieved at temperatures ranging from – 263 to 240 °C, with a small dependence of the critical stress on the temperature; thus, this SMA is a promising material for practical applications. We can find further details about Fe–SMA alloys and strips in (Sawaguchi et al. 2016; Hosseini et al. 2019b; Soroushian et al. 1770). These Fe–SMA strips or rebars, are already in use and they can be found in a variety of rehabilitation projects (CEN 2004; Pan et al. 2019), and concrete T-beams that are shear-critical reinforced can be reinforced using Fe–SMA alloy.
Applications involving reinforced concrete beams
Shape memory alloys (SMAs) and already present or new RC bodies can be utilized together to give new capabilities or improve their protective ability and toughness, according to recent research (Cladera et al. 2014a, 2014b; Fritsch et al. 2010; Abouali et al. 2019; Cortés-Puentes et al. 2018; Varughese and El-Hacha 2020). The majority of research on employing SMAs in structural engineering to date has focused on improving dam** capacity and superelastic behavior by utilizing Ni–Ti alloys and Cu-based alloys, especially to develop vibration mitigation and enhance seismic resistance to civil structures (Cladera et al. 2014b; Cortés-Puentes et al. 2018; Varughese and El-Hacha 2020; Otsuka and Wayman 1998; Ozbulut et al. 2011a). However, one research has employed superelastic behavior to develop the behavior of reinforced concrete members that are shear-critical and approaching their failure state. Mas et al. (2016) conducted experimental research on the shear failure of continuous rectangular spiral internal pseudoelastic Ni–Ti reinforced concrete beams. They came to the conclusion that trading steel reinforcement for SMAs in actual structure was hardly cost-effective due to current Ni–Ti’s technology and price, and the fact that these materials should only be utilized in places of the structures where they are absolutely necessary because they permit the formation of high-tech fuses to safeguard the whole architecture. As a result, studies to tackle the distinct structural challenges in specific places by using superelastic Ni–Ti alloys are still going strong (Nahar et al. 2019; Wang et al. 2019; Navarro-Gomez and Bonet 2019; Casagrande et al. 2019), and the same is happening in the study to use the other cost-effective SMAs like Cu–Al–Mn (Hosseini et al. 2019b). The research on utilizing Fe–SMA strips to retrofit reinforced concrete T-beams as shear external reinforcement was presented by Zerbe et al. (2017). The retrofitted beams’ shear strength was increased by 20 to 25% in this study; however, the anchorage system used did influence the test results, and the final outcomes of the research were hardly definitive. Montoya-Coronado et al. (2019) gave the latest findings of a campaign aimed at determining the possibility of utilizing Fe–SMA strips to reinforce shear critical beams using Fe–SMA strips through experiments. The Fe–SMA strips were thoroughly investigated. Ten small-scale beam tests clearly demonstrated the improvement in shear strength of beams that are retrofitted, by examining a fully wrapped new anchorage system. The findings of preliminary shear strengthening in T-beams were presented by Shahverdi et al. (2019). They utilized shotcrete mortar and ribbed “memory steel” stirrups. One significant discovery was that the system’s operation was not influenced by bending the corners of the stirrups. The prestressing effect was validated by reduced widths of crack for service loads, according to the authors who produced the results that a shotcrete layer embedded with Fe–SMA stirrups was a possible shear strengthening option which was straightforward for implementing in appropriate applications. The SMA employed in the shear strengthening procedures (Zerbe et al. 2017; Montoya-Coronado et al. 2019; Shahverdi et al. 2019) is a cost-effective SMA. The composition of the alloy is 63%Fe–17%Mn–5%Si–10%Cr–4%Ni–1% (V, C) (in mass %) (Dong et al. 2009). It's worth noting that Fe, a relatively inexpensive mineral, makes up about 63 percent of its bulk. Despite the fact that superelasticity isn't applicable for the mentioned alloy due to its imperfect martensitic transformation, the high ductility and shape memory effect (SME) are noticeable (Cladera et al. 2014a; Shahverdi et al. 2020; Hosseini et al. 2018) and contain extra information on Fe-based SMA alloys and strips. These Fe–SMA strips or rebars are being utilized in various projects involving real rehabilitation (Schranz et al. 2019; Mercier et al. 2019), and they can be used to reinforce shear-critical concrete T-beams.
Other applications of Fe-based SMAs
Fe-based SMAs in civil engineering constructions are still in their infancy, with only a few research applications documented in the field. However, two uses in other similar industries have been successful: the fabrication of crane rail fishplates to link fixed sections of rails (as shown in Fig. 8), for highly durable cranes (Maruyama and Kubo 2011) and pipe couplings for pipelines. Ghafoori et al. investigated the alloy’s cyclic deformation and fatigue behavior (Izadia et al. 2018). They found that during high cycle fatigue loads, the stiffness of the alloy was fairly constant, but the recovery stress was reduced, which was attributed to transition-induced stress relief under fatigue loading. A formula was also proposed by them for safely designing alloys as structural reinforcement under high cycle fatigue loading conditions.
Moreover, Hosseini et al. investigated the development of stress recovery of alloys under various constraint parameters (Hosseini et al. 2018). They examined the pressure-treated alloy’s cyclic response after a second thermal activation. They discovered that, despite the fact that the amplitude of the restoring force decreased under cyclic loading, it was found that secondary thermal activation can recover most of the relaxed restoring force. Fe–SMAs are in the free-stressed austenite phase at ambient temperature. The stress causes a so-called martensitic transformation (i.e., direct transition) from γ austenite to ε martensite phase, producing stress-induced martensite. After heating and cooling, the recoverable martensitic phase transition can be reversed to form the austenitic phase. Consequently, during the reverse transformation, the Fe–SMA recovers its original shape. When the distortion of Fe–SMA is controlled while reverse transformation, the alloy creates restorative stresses in an attempt to come back to its original shape. This recovery stress could be applied to buildings to provide prestressing forces. Fe-based SMA strips were implanted in the center of the concrete bars and Fe-based SMA strips were also used to reinforce concrete beams (Czaderski et al. 2015). Fe–SMA ribbed reinforcement is used in ongoing research to reinforce large beams. The key applications of Fe-based SMAs are listed in Fig. 9.
Transformation in Fe–Mn–Si–Cr–Ni SMA
The impact of microstructural changes on the shape memory performance of Fe15Mn7Si9Cr5Ni (wt.%) stainless steel SMA was reported by Bikas C et al. (2003). The transition temperatures and material composition of the component phases are given in Table 1.
Transformation in Fe–Mn–Si–Co SMA
The transition temperatures of Fe–30Mn–6Si–xCo (x = 0 to 9 wt. pct.) SMAs were investigated by Maji, B.C. et al. (2013). They came to the conclusion that adding cobalt lowers the hindrance to plastic yielding. The influence of (Fe, -Co)5Mn3Si2 precipitates, however, induces an increase in flow stress above 5% Co. In Co-containing alloys, plastic yielding appears to be nonuniform and occurs concurrently with the formation of stress-induced martensite. Table 2 shows the transformation temperatures of Fe–Mn–Si–Co:
SME improvisation experiment in Fe–Mn–Si-based SMA
M.J. Xue et al. (2022). proposed decreasing annealing twin boundary (ATB) density to increase the shape memory effect of Fe–Mn–Si-based alloys. Their results showed that reducing ATB density does not result in the improvement of the shape memory effect. An ingot of the composition Fe–20Mn–5.5Si–9Cr–5Ni (wt%) was melted under an argon atmosphere using induction melting. The cylindrical ingot was forged into a billet at 1050 °C. Blocks cut from the billet are subjected to a solution treatment, followed by water quenching. Certain blocks were annealed, followed by air cooling. The Shape memory effect of these samples was assessed by bending around a series of half-circle molds with different radii and performing tensile tests to analyze the strain and shape recovery. The TEM image of the alloy after 4% tensile deformation is shown in Fig. 10.
TEM analysis after 4% tensile deformation. a Image portraying the stress-induced martensite plate. b Selected area diffraction pattern of the highlighted area. c Key figure of b. (Xue et al. 2022) (reused with permission from Elsevier)
Experimental study of Fe–Mn–Si–Cr SMA
The cause of temperature’s effect on critical stress of Fe–Mn–Si–Cr SMA for several loading conditions was inspected by Takamasa Yoshikawa et al. (2017). Fe–28Mn–6Si–5Cr is the chemical composition of the material utilized. This material's transition temperatures are listed below in Table 3.
The sample material rod was given a shape memory treatment at 1223 K for 30 min before being quenched in water. The material was initially loaded at varied temperatures. The pieces were loaded with tension, compression, and torsion at a strain rate of 2 × 10−4 s−1 under various temperatures. The high-temperature strain gauge was applied to calculate the strain as well as the shape recovery during sample loading and unloading. Experimental results show that this material undergoes a stress-induced martensitic transition before failure at ambient temperatures of uni-axial tension, compression, and torsion. Since the yield stress in that particular material is greater than martensitic transition stress at room temperature, it can exhibit a shape memory effect. Above 135 °C, the critical stresses of the materials change back. Rather than improving the SME of that material, deformation at temperatures above 135 °C improves the plastic workability. As a result, using the shape memory effect in that workpiece requires deformation below 135 °C.
A. Baruj et al. (2010) studied the mechanical behavior of Fe–28Mn–6Si–5Cr (wt%) alloy after basic thermomechanical treatment including aging at 800 °C for 10 min after rolling at 600 °C. They concluded that, up to 110 °C, martensite can be induced in this material and stress-induced martensite was not observed in this material at temperatures above 150 °C. Furthermore, at temperatures between 90 °C and 110 °C, a relatively substantial pseudo-elastic behavior was found, correlating with the fact that martensite occurs in this region.
J. Ma et al. (2012) used thermal cycling to study the shape memory properties of the single crystal material Fe–28Ni–17Co–11.5Al–2.5Ta (at. %) at constant levels of tensile and compressive stress. The observed transition strain levels in all samples were lower than theoretically evaluated, potentially due to a huge volume fraction of non-transforming particles, partial martensite alignment due to martensite variant interactions, and a marginally greater martensite c/a ratio in the specimens used in their research.
Iwamoto T. et al. (2015) performed an experimental analysis of the rate-sensitive tensile deformation characteristic of Fe–SMA alloys. Two separate test rigs were used to perform tensile tests on iron-based shape memory alloys at various strain rates: a current material testing machine and the split Hopkinson pressure bar technique-based impact testing equipment. During the testing, a thermocouple was used to record the temperature rise during quasi-static deformation. The improved deformation owing to the shape memory effect was determined after a quasi-static test by heating the deformed specimen to the Af temperature. At last, they conclude by making the following points:
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1.
The true stress level rises as the strain rates increase. The effect of positive rate sensitivity on deformation behavior may be seen clearly. The viscous drag that occurs during mobile dislocation and/or twinning causes stress to increase in proportion to the strain rate, which is a well-known thermal activation process. There is a correlation between the promotion of the deformation and an increase in temperature. A suppression of martensitic transformation is brought about as a result of the temperature change. A greater amount of stress should be applied due to the suppression in order to obtain the desired level of strain. Let us take a hypothetical scenario in which there is no heating as a result of irreversible work. This will help us better understand the mechanism. When the martensitic transformation itself becomes less significant in relation to the strain as a result of a change in the strain rate, the deformation process must be subjected to a significantly greater level of stress.
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2.
The shape recovery factor is independent of the strain rate for quasi-static tests using different strain rates. Figure 11 summarizes the effects of stress and temperature on the Fe–Mn–Si–Cr SMA.
Scope for applications and upcoming applications
Takahiro Sawaguchi et al. have worked on Fe–Mn–Si based Alloys to seismic response control (Sawaguchi et al. 2016). Wandong Wang et al. have developed a new approach for fatigue strengthening of structures made of metals that utilizes a property of SMA viz, shape memory effect of a Fe–SMA as well as the mechanism of bridging provided by the bonding process (Wang et al. 2021). Antoni Cladera et al. worked on using iron-based SMAs to reinforce slender concrete T-shaped beams (Cladera et al. 2020). T. Maruyama et al. have researched the connection of rails with SMA fishplates, SMA fishplates for crane rails, Pipe joints for steel pipes, and so on (Maruyama and Kubo 2011). Kinam Hong et al. Kinam Hong et al. wanted to see if a Fe–SMA might be used to reinforce civil structures (Hong et al. 2018). Diego Isidoro Heredia Rosa used uniaxial coupon experiments to explore the behavior of Fe–SMAs subjected to cyclic inelastic straining (Rosa et al. 2020). Mohammadreza Izadi et al. Retrofitted the steel bridge connections that are cracked due to fatigue using smart Fe–SMAs (Izadi et al. 2019a). Moslem Shahverdi et al. studied the material characterization of Fe-based SMA strips for the reinforcement of reinforced concrete components (Shahverdi et al. 2018). SMAs, such as Ni–Ti–Nb alloys, can be used in civil engineering applications because of their superelasticity or SME properties (Choi et al. 2012; Wei and ** are the applications of superelasticity that have been primarily focused in civil engineering construction (Rojob and El-Hacha 2017; Sun and Rajapakse 2003; Graesser and Cozzarelli 1991). Conventional strengthening procedures can be addressed by the introduction of novel materials with unique features, like carbon-fiber reinforced polymers (CFRPs) and Fe–SMAs (Izadi et al. 2018a, 2018b; Hollaway 2002; Teng et al. 2012; Ghafoori and Motavalli 2015a; Ghafoori et al. 2012). The usage of prestressed (activated) CFRP composites for fatigue strengthening of various steel members has piqued curiosity (Teng et al. 2012; Ghafoori et al. 2012; Ghafoori and Motavalli 2015b, 2015c; Shaat et al. 2004), but the usage of prestressed Fe–SMAs for steel strengthening is a relatively new concept (Izadi et al. 2018a, 2018b; Izadi et al. 2019b) and has a greater scope for future applications and research. Table 4 lists the current research on iron-based SMAs in the field of civil engineering.
Novel fatigue strengthening method done by Wandong Wang et al. (2021) (Reused from Elsevier under the terms of the Creative Commons CC-BY license)
Current research needs
Despite extensive investigations on the behavior of Fe–Mn–Si alloys, some aspects remain unsolved, necessitating future research on specific topics. Despite the fact that the recovery stresses are an essential crucial place for employing SMAs as prestressing materials, a vast majority of studies on thermomechanical treatments throughout the process of production have concentrated on something like develo** the recovery strain, etc. As a result, a thorough examination of improving the efficiency of recovery stresses for various compositions of alloys is necessary. Furthermore, relaxation and fatigue aspects have not been adequately explored in terms of material attributes. More information on corrosion behavior can be found, but for prestressing applications, knowing the corrosion characteristics of concrete in an alkaline environment is essential. Obtaining huge amounts of materials that are necessary for civil engineering applications and extremely large production demands research. In order to produce any product, it is a necessity to develop weldability expertise. Various publications cover the weldability characteristics in the austenite phase of Fe-based SMAs, however for a given welded alloy kept in the martensitic phase, knowing the temperature-influenced zone in it for various welding procedures would be immensely beneficial. The development of low-cost materials and the research of novel industrial applications for Fe-based SMAs are the two main issues to be tackled. Given that the Fe–Mn–Si SMA shows only one cycle of the SME and afterward functions as a reinforcement component at the installation site, we are optimistic about establishing a new application field for it. The Fe–Mn–Al–Ni SMA also suffers from cyclic superelasticity deterioration, which is a common problem with superelastic alloys. In Fe–Mn–Al–Ni alloys, rapid superelasticity deterioration has been observed (Vollmer et al. 2016), which should be addressed for realistic cyclic applications. Long-term aging at room temperature has also been found to change the critical stress (Ozcan et al. 2018). The temperature-based SME has received less study because the output stress values that are received as output are not found to be significant. The reverse SME (Peng et al. 2017) was just observed. Due to its best-in-class shape memory capabilities (Miyazaki et al. 1981, 1999) and biocompatibility (Mantovani 2000), Ni–Ti alloys are being commercially used in sectors such as healthcare, automobile, aviation, and seismic, as well as for end-user goods (Humbeeck 1999; Morgan 2004; Jani et al. 2014; Desroches and Smith 2004; Janke et al. 2005b). No real application of Fe-based SMAs for structural dam** has been documented so far. The large dam** impact generated by the martensitic transformation is reported in TRIP/TWIP Fe–Mn alloys (Lee et al. 1996; Jee et al. 1997; Frommeyer et al. 2003; Watanabe et al. 2010). Sawaguchi et al. (Sawaguchi et al. 2006a, 2006b) discovered that the Fe–28Mn–6Si–5Cr–05NbC SMAs had a dam** capacity of over 0.1% in the large-strain amplitude area. The corrosion resistance of Fe–Mn–Si SMAs has been investigated for various compositions of alloys in severe surroundings like NaCl and H2SO4 solutions (Söderberg et al. 1999; Lin et al. 2002; Huang et al. 2004; Maji et al. 2006; Hu et al. 2009; Charfi et al. 2009, 2012; Della Rovere et al. 2011, 2012a, 2012b). The corrosion resistance in an alkaline environment, however, is yet to be investigated. Although several investigations on the weldability features of Fe-based SMAs have been conducted (Janke et al. 2005a; Lin et al. 2000; Dong et al. 2006; Qiao et al. 2007; Zhou et al. 2010, 2012), more research is required. Some other SMAs, like Ni–Ti or Cu–based alloys, are being used in structural applications (Li et al. 2013; Alam et al. 2007; Song et al. 2006; Czaderski et al. 2006; Wu et al. 2012; Ozbulut et al. 2011b; Sun 2011; Branco et al. 2012; Isalgue et al. 2012; Dommer and Andrawes 2012; Muntasir-Billah and Alam 2012; Cladera et al. 2013; Torra et al. 2013), therefore Fe-based SMAs should receive more attention for their construction applications. However, as the demand for SMAs develops, researchers must concentrate their efforts on creating new SMAs with new capabilities and features (Fe-based SMAs), which will be a viable replacement for Ni–Ti SMAs in the near future. Figure 13 summarises the key research needed to pursue research in the field of Fe-based SMAs. Figure 13 summarises the key research needed to pursue research in the field of Fe-based SMAs.
Conclusions
This paper gives an overview of the Martensitic transformation of different compositions of Fe-based SMAs, their applications, and future research needs. In comparison with original alloys that emerged in the 1980s, study on new Fe-based SMAs has accelerated significantly in the last decade, with the development of Fe–Mn–Si alloys which yield recovery stresses at a higher level at reduced temperature conditions. Utilization of Fe-based SMA tendons for replacing or reinforcing actual buildings is propitious for the foreseeable future. There are various advantages to using iron-based SMA tendons, including negligible friction losses, no need for anchor heads and ducts, and no need for room to apply the force by hydraulic equipment. The cost has been cheaper for these new Fe-based SMAs because of the usage of inexpensive iron as well as the ability to melt and produce those SMAs in regular atmospheric conditions. These novel Fe–Mn–Si alloys have stronger elastic stiffness and broad temperature transition hysteresis than existing SMAs, such as Ni–Ti alloys. They are also easy to work with, corrosion-resistant, and weldable. In recent times, new Fe–Mn–Si shape memory alloys that have fine precipitates are being produced, conceding for high recovery stresses without requiring thermomechanical conditioning.
Availability of data and materials
Since this is a review paper there is no data associated with the manuscript.
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One of the authors, Dr Santosh Sampath gratefully acknowledges the funding from Science and Engineering Research Board (SERB), India and Sri Sivasubramaniya Nadar Trust through file numbers, SUR/2022/001060 and SSN/IFFP/DECEMBER 2021/1–21/08, respectively.
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The authors confirm their contribution to the paper as follows: study conception and design: S.S.; data collection: P.M.; analysis and interpretation of results: S.S., P.M; draft manuscript preparation: S.S. All authors reviewed the results and approved the final version of the manuscript.
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Santosh, S., Pavithran, M. Iron-based smart alloys for critical applications: a review on processing, properties, phase transformations, and current trends. J Mater. Sci: Mater Eng. 19, 8 (2024). https://doi.org/10.1186/s40712-024-00150-2
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DOI: https://doi.org/10.1186/s40712-024-00150-2