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 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.

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.

In situ TEM tensile testing on high-entropy alloy coating by laser surface alloying

2017 ◽  
Vol 708 ◽  
pp. 380-384 ◽  
Author(s):  
Zhaobing Cai ◽  
Xiufang Cui ◽  
Guo Jin ◽  
Binwen Lu ◽  
Danli Zhang ◽  
...  
Keyword(s):  
Tensile Testing ◽  
Alloy Coating ◽  
Laser Surface ◽  
High Entropy Alloy ◽  
In Situ Tem ◽  
Surface Alloying ◽  
Laser Surface Alloying ◽  
High Entropy

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
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