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Article
Understanding the Mechanism for the In-Plane Yielding Anisotropy of a Hot-Rolled Zirconium Plate
Previously, the in-plane mechanical anisotropy of Zr hot-rolled plates is ascribed mainly to the different activities of the deformation modes activated when loading along different directions. In this work, a...
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Article
Effect of Zr micro-alloying on microstructure refinement and mechanical property of CoCrNi medium-entropy alloy processed by high-pressure torsion and subsequent annealing
Medium-entropy alloys (MEAs) have recently emerged as potential replacements for traditional alloys in high-performance applications. Among the various MEAs developed, equi-atomic CoCrNi MEA stands out for its...
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Article
On the Aging Behavior of Ti-1.0 wt pct Fe Alloy With an Equiaxed α + β Initial Microstructure
The aging behavior (300 °C to 700 °C) of Ti-1.0 wt pct Fe alloy was investigated in this study, by means of various microstructural characterization techniques and micromechanical testing methods. The initial...
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Article
Open AccessGrain refinement in titanium prevents low temperature oxygen embrittlement
Interstitial oxygen embrittles titanium, particularly at cryogenic temperatures, which necessitates a stringent control of oxygen content in fabricating titanium and its alloys. Here, we propose a structural s...
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Article
Open AccessDestruction of mesoscopic chemically modulated domains in single phase high entropy alloy via plastic deformation
Chemically modulated mesoscopic domains in a fcc single phase CrMnFeCoNi equi-atomic high entropy alloy (HEA) are detected by small angle diffraction performed at a synchrotron radiation facility, whereas the ...
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Article
Open AccessNeighborhood-level socioeconomic factors moderate the association between physical activity and relative age effect: a cross-sectional survey study with Japanese adolescents
Relative age effect is defined as a phenomenon where children born early generally perform better than children born later in the same cohort. Physical activity is an important factor that might be influenced ...
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Chapter
Proposing the Concept of Plaston and Strategy to Manage Both High Strength and Large Ductility in Advanced Structural Materials, on the Basis of Unique Mechanical Properties of Bulk Nanostructured Metals
Advanced structural materials are required to show both high strength and large ductility/toughness, but we have not yet acquired the guiding principle for that. The bulk nanostructured metals are polycrystall...
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Article
Open AccessInvestigating the dislocation reactions on Σ3{111} twin boundary during deformation twin nucleation process in an ultrafine-grained high-manganese steel
Some of ultrafine-grained (UFG) metals including UFG twinning induced plasticity (TWIP) steels have been found to overcome the paradox of strength and ductility in metals benefiting from their unique deformati...
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Article
Open AccessUnique transition of yielding mechanism and unexpected activation of deformation twinning in ultrafine grained Fe-31Mn-3Al-3Si alloy
Tensile mechanical properties of fully recrystallized TWIP steel specimens having various grain sizes (d) ranging from 0.79 μm to 85.6 μm were investigated. It was confirmed that the UFG specimens having the mean...
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Article
Open AccessA correlation between grain boundary character and deformation twin nucleation mechanism in coarse-grained high-Mn austenitic steel
In polycrystalline materials, grain boundaries are known to be a critical microstructural component controlling material’s mechanical properties, and their characters such as misorientation and crystallographi...
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Article
Heterogeneity and Homogeneity in 2/4 N Multilayered Al Fabricated by Accumulative Roll Bonding and Annealing
Multilayered Al sheets having alternative stacking of 2 N Al (99.21 wt.% purity, N is short for nine) and 4 N Al (99.993 wt.% purity, N is short for nine) with various layer thicknesses from 16 to 1 μm were fa...
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Article
Investigation on the Microstructure and Mechanical Properties of Ti-1.0Fe Alloy with Equiaxed α + β Microstructures
In this study, the microstructural characteristics and mechanical properties of Ti-1.0Fe alloy with equiaxed α + β microstructures were investigated in detail. Four different equiaxed α + β microstructures with β
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Article
Open AccessYield strength and misfit volumes of NiCoCr and implications for short-range-order
The face-centered cubic medium-entropy alloy NiCoCr has received considerable attention for its good mechanical properties, uncertain stacking fault energy, etc, some of which have been attributed to chemical ...
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Article
Effect of Hydrogen on the Substructure of Lenticular Martensite in Fe-31Ni Alloy
This study investigated the effect of hydrogen on the substructure of martensite in Fe-31Ni alloy. In both the hydrogen-charged and uncharged specimens, typical lenticular martensite plates formed after subzer...
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Article
Open AccessChange of Deformation Mechanisms Leading to High Strength and Large Ductility in Mg-Zn-Zr-Ca Alloy with Fully Recrystallized Ultrafine Grained Microstructures
Recently, we have found that fully recrystallized ultrafine-grained (UFG) microstructures could be realized in a commercial precipitation-hardened Magnesium (Mg) alloy. The UFG specimens exhibited high strengt...
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Chapter and Conference Paper
In Situ Neutron Diffraction Study on Microstructure Evolution During Thermo-Mechanical Processing of Medium Manganese Steel
The microstructure evolution of medium manganese steel (Fe-5Mn-2Si-0.1C (wt%)) during thermo-mechanical processing in ferrite + austenite two-phase region was investigated by in situ neutron diffraction analys...
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Chapter and Conference Paper
Relationship Between Applied Stress and Hydrogen-Related Fracture Behavior in Martensitic Steel
In the present study, a relationship between the applied stress and the hydrogen-related fracture behavior in an 8Ni-0.1C martensitic steel was investigated by means of constant loading tensile tests under var...
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Article
Hydrogen embrittlement behaviors of ultrafine-grained 22Mn–0.6C austenitic twinning induced plasticity steel
Hydrogen embrittlement behaviors of a 22Mn–0.6C (mass%) twinning induced plasticity (TWIP) steel with the grain sizes of 21 µm (coarse grain) and 0.58 µm (ultrafine grain) were investigated by means of hydroge...
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Article
On the Stability of Reversely Formed Austenite and Related Mechanism of Transformation in an Fe-Ni-Mn Martensitic Steel Aided by Electron Backscattering Diffraction and Atom Probe Tomography
The stability of reversely formed austenite and related mechanism of transformation were investigated against temperature and time in an Fe-9.6Ni-7.1Mn (at. pct) martensitic steel during intercritical anneali...
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Article
SEM/EBSD Analysis on Globularization Behavior of Lamellar Microstructure in Ti-6Al-4V During Hot Deformation and Annealing
Scanning electron microscope/electron back-scattering diffraction was used to investigate local misorientation development within an individual α plate of a Ti-6Al-4V alloy with an α lamellar microstructure durin...
