-
Article
Open AccessThe Effect of Al on the Formation of a CrTaO4 Layer in Refractory High Entropy Alloys Ta-Mo-Cr-Ti-xAl
In this study, the effect of Al on the high temperature oxidation of Al-containing refractory high entropy alloys (RHEAs) Ta-Mo-Cr-Ti-xAl (x = 5; 10; 15; 20 at%) was examined. Oxidation experiments were performed...
-
Article
Effect of Different Cr and Ni Additions on Oxidation Behavior of Co-Re-Based Alloys
The oxidation characteristics of Co-17Re-Cr-Ni alloys with varying Cr (18 at.% and 23 at.%) and Ni (8 at.%, 15 at.%, and 25 at.%) concentrations have been investigated at 1000°C in air. The corrosion resistanc...
-
Chapter and Conference Paper
Influence of Microstructural Inhomogeneities on the Fatigue Crack Growth Behavior Under Very Low Amplitudes for Two Different Aluminum Alloys
In the present paper the aluminum alloys EN AW-6082 (peak-aged and overaged) and EN AW-5083 (solution annealed) were investigated regarding the long fatigue crack growth behavior in the range of very low ampli...
-
Article
Contribution of Lattice Distortion to Solid Solution Strengthening in a Series of Refractory High Entropy Alloys
We present an experimental approach for revealing the impact of lattice distortion on solid solution strengthening in a series of body-centered-cubic (bcc) Al-containing, refractory high entropy alloys (HEAs) ...
-
Chapter
Development of a fatigue life prediction concept in the very high cycle fatigue range based on covariate microstructural features
In the present work the dependence between the size and space distribution of defects relating to the material quality as well as the size and location of failure initiation defects in fatigue specimens correl...
-
Article
Characterization of Oxidation Kinetics of Mo–Si–B-Based Materials
Characterization of oxidation kinetics of composites based on refractory metals like Mo by means of thermogravimetry is often very complex, because of the simultaneous formation of both volatile and stable oxi...
-
Chapter and Conference Paper
Application of Energy Dispersive PNCCD Detector in Material Science using hard X-Rays
The pn-junction Charge Couple Device - pnCCD - is a versatile detector which offers the possibility to perform Energy-Dispersive X-ray Diffraction (EDXD) experiments using white Xray radiation. Because the poi...
-
Article
Creep Resistance and Oxidation Behavior of Novel Mo-Si-B-Ti Alloys
Mo-Si-B-alloys are promising materials for high-temperature applications because of their high melting point, excellent phase stability, large alloying capabilities, and reasonable mechanical as well as oxidat...
-
Article
Microstructure and Oxidation Mechanism Evolution of Co–17Re–25Cr–2Si in the Temperature Range 800–1,100 °C
The oxidation behavior of the newly developed Co–Re–Cr-based alloy Co–17Re–25Cr–2Si (at.%) has been studied in laboratory air at 800–1,100 °C. A transition of oxidation mechanism was observed in the alloy with...
-
Article
A Study on Effect of Reactive and Rare Earth Element Additions on the Oxidation Behavior of Mo–Si–B System
Mo–9Si–8B–1Ti, Mo–9Si–8B–1.8Ti, Mo–9Si–8B–0.2La and Mo–9Si–8B–0.4La2O3 (at.%) alloys were prepared using mechanical alloying followed by hot isostatic pressing and field assisted sintering. XRD, SEM and EBSD anal...
-
Article
Tenogenic differentiation of equine adipose-tissue-derived stem cells under the influence of tensile strain, growth differentiation factors and various oxygen tensions
Mesenchymal stem cells have become extremely interesting for regenerative medicine and tissue engineering in the horse. Stem cell therapy has been proven to be a powerful and successful instrument, in particul...
-
Article
Effect of Yttrium Alloying on Intermediate to High-Temperature Oxidation Behavior of Mo-Si-B Alloys
The oxidation behavior of 0.2 Y-alloyed Mo-9Si-8B (at. pct) was investigated in a wide temperature range from 923 K to 1673 K (650 °C to 1400 °C). Formation of a thin yttrium-silicate scale at the outer layer ...
-
Article
Stress-Dependent Elastic Behaviour of a Titanium Alloy at Elevated Temperatures
In this study the influence of stress and temperature on the elastic modulus during fully-reversed low cycle fatigue of the titanium alloy Ti6242 is examined. The change of the elastic properties with stress m...
-
Article
Oxidation behavior of Mo-Si-B-(X) alloys: Macro- and microalloying (X= Cr, Zr, La2O3)
High melting Mo-Si-B based alloys exhibit good mechanical properties and oxidation resistance at very high temperatures. The alloy composition Mo-9Si-8B (at.%) shows excellent oxidation behavior between 900°C–...
-
Article
The high-temperature oxidation behavior of Co-Re-Cr-based alloys
Co-Re-Cr-based model alloys have been developed for high-temperature applications beyond 1,200°C. The purpose of the present investigation is to gain an insight into the oxidation mechanisms of the model Co-Re...
-
Article
Effect of Shot-peening on the Oxidation Behaviour of Boiler Steels
The presence of short diffusion paths is very important for rapid diffusion processes which are involved in forming protective oxide layers against high temperature corrosion, e.g. on boiler steels. Rapid diff...
-
Article
Modelling High Temperature Oxidation in Iron–Chromium Systems: Combined Kinetic and Thermodynamic Calculation of the Long-Term Behaviour and Experimental Verification
The oxidation of two industrial steels with different chromium content (9 and 12 wt%), oxidised for up to 120 h at 750 °C in air has been investigated experimentally and by means of two-dimensional theoretical...
-
Article
Effect of Duplex Aging on the Initiation and Propagation of Fatigue Cracks in the Solute-rich Metastable β Titanium Alloy Ti 38-644
Aging of highly β-stabilized titanium alloys commonly leads to the formation of precipitate-free zones being susceptible to fatigue crack initiation. Duplex aging improves the fatigue properties of metastable β t...
-
Chapter and Conference Paper
Propagation of SAW and PSAW in a Smart AlN/Diamond/γ-TiAl Structure
For online monitoring and prediction of surface or near-surface changes such as corrosion, cracks and crack-like defects, propagation of surface acoustic waves (SAW) and pseudo surface acoustic waves (PSAW) in...
-
Article
The Effect of Pre-Oxidation Treatment on the High-Temperature Oxidation of Co–Re–Cr Model Alloys at Laboratory Air
The aim of a pre-oxidation treatment at low oxygen partial pressure is to promote the formation of a Cr2O3 (or Al2O3) scale in such a way that the oxide layer can reliably prevent the contact of oxygen with the m...
