Sluggish hydrogen diffusion and hydrogen decreasing stacking fault energy in a high-entropy alloy

2020 ◽  
pp. 101902
Author(s):  
Zhou-Can Xie ◽  
Yun-Jiang Wang ◽  
Chunsheng Lu ◽  
Lan-Hong Dai
Keyword(s):  
Hydrogen Diffusion ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
High Entropy Alloy ◽  
High Entropy

scholarly journals Generalized Stacking Fault Energy of Al-Doped CrMnFeCoNi High-Entropy Alloy

Nanomaterials ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 59 ◽  
Author(s):  
Xun Sun ◽  
Hualei Zhang ◽  
Wei Li ◽  
Xiangdong Ding ◽  
Yunzhi Wang ◽  
...  
Keyword(s):  
Interfacial Energy ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Al Content ◽  
Generalized Stacking Fault ◽  
Generalized Stacking Fault Energy

Using first-principles methods, we investigate the effect of Al on the generalized stacking fault energy of face-centered cubic (fcc) CrMnFeCoNi high-entropy alloy as a function of temperature. Upon Al addition or temperature increase, the intrinsic and extrinsic stacking fault energies increase, whereas the unstable stacking fault and unstable twinning fault energies decrease monotonously. The thermodynamic expression for the intrinsic stacking fault energy in combination with the theoretical Gibbs energy difference between the hexagonal close packed (hcp) and fcc lattices allows one to determine the so-called hcp-fcc interfacial energy. The results show that the interfacial energy is small and only weakly dependent on temperature and Al content. Two parameters are adopted to measure the nano-twinning ability of the present high-entropy alloys (HEAs). Both measures indicate that the twinability decreases with increasing temperature or Al content. The present study provides systematic theoretical plasticity parameters for modeling and designing high entropy alloys with specific mechanical properties.

Temperature dependent stacking fault energy of FeCrCoNiMn high entropy alloy

2015 ◽  
Vol 108 ◽  
pp. 44-47 ◽  
Author(s):  
Shuo Huang ◽  
Wei Li ◽  
Song Lu ◽  
Fuyang Tian ◽  
Jiang Shen ◽  
...  
Keyword(s):  
Stacking Fault ◽  
Stacking Fault Energy ◽  
High Entropy Alloy ◽  
Temperature Dependent ◽  
High Entropy

Deformation twinning behaviors of the low stacking fault energy high-entropy alloy: An in-situ TEM study

2017 ◽  
Vol 137 ◽  
pp. 9-12 ◽  
Author(s):  
Jiabin Liu ◽  
Chenxu Chen ◽  
Yuqing Xu ◽  
Shiwei Wu ◽  
Gang Wang ◽  
...  
Keyword(s):  
Deformation Twinning ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
High Entropy Alloy ◽  
In Situ Tem ◽  
High Entropy

scholarly journals Effects of rotational speed on the Al0.3CoCrCu0.3FeNi high-entropy alloy by friction stir welding

2020 ◽  
Vol 39 (1) ◽  
pp. 556-566 ◽  
Author(s):  
Po-Ting Lin ◽  
Chan-Sheng Wu ◽  
Chun-Hao Peng ◽  
Che-Wei Tsai ◽  
Yutaka S. Sato
Keyword(s):  
Friction Stir Welding ◽  
Cubic Boron Nitride ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
High Entropy Alloy ◽  
Electron Backscattered Diffraction ◽  
High Entropy ◽  
Practical Applications ◽  
Friction Stir ◽  
Microhardness Distribution

AbstractWelding and relevant studies are indispensable to employ high-entropy alloys for practical applications. In this study, Al0.3CoCrCu0.3FeNi high-entropy alloy with single FCC phase was used to make “bead-on-plate” friction stir welds at different rotational speeds, and the effects on microstructure and mechanical properties were studied. Several banded structures containing oxide or nitride particles were observed in the stir zone (SZ), and the chemical wear of the polycrystalline cubic boron nitride tool was confirmed. The microhardness distribution of the welds showed higher hardness in the SZ because of grain refinement and the presence of deformed grains. The electron backscattered diffraction results suggested that the high-entropy alloy with low stacking-fault energy experienced recrystallization during friction stir welding, which was similar to other conventional materials with low stacking-fault energy.

scholarly journals Correlating work hardening with co-activation of stacking fault strengthening and transformation in a high entropy alloy using in-situ neutron diffraction

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
M. Frank ◽  
S. S. Nene ◽  
Y. Chen ◽  
B. Gwalani ◽  
E. J. Kautz ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Work Hardening ◽  
Dislocation Motion ◽  
Stacking Fault ◽  
Dislocation Slip ◽  
Simultaneous Increase ◽  
High Entropy Alloy ◽  
High Entropy ◽  
In Situ Neutron Diffraction

AbstractTransformation induced plasticity (TRIP) leads to enhancements in ductility in low stacking fault energy (SFE) alloys, however to achieve an unconventional increase in strength simultaneously, there must be barriers to dislocation motion. While stacking faults (SFs) contribute to strengthening by impeding dislocation motion, the contribution of SF strengthening to work hardening during deformation is not well understood; as compared to dislocation slip, twinning induced plasticity (TWIP) and TRIP. Thus, we used in-situ neutron diffraction to correlate SF strengthening to work hardening behavior in a low SFE Fe40Mn20Cr15Co20Si5 (at%) high entropy alloy, SFE ~ 6.31 mJ m−2. Cooperative activation of multiple mechanisms was indicated by increases in SF strengthening and γ-f.c.c. → ε-h.c.p. transformation leading to a simultaneous increase in strength and ductility. The present study demonstrates the application of in-situ, neutron or X-ray, diffraction techniques to correlating SF strengthening to work hardening.

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