scholarly journals Twin boundary migration and reactions with stacking fault tetrahedron in Cu and CoCrCuFeNi high-entropy alloy

2022 ◽  
Author(s):  
Tao Fu ◽  
Hao Hu ◽  
Sen Hu ◽  
Qihao Liang ◽  
Shayuan Weng ◽  
...  
Keyword(s):  
Twin Boundary ◽  
Boundary Migration ◽  
Stacking Fault ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Stacking Fault Tetrahedron

scholarly journals Formation and Anisotropic Mechanical Behavior of Stacking Fault Tetrahedron in Ni and CoCrFeNiMn High-Entropy Alloy

2022 ◽  
Vol 8 ◽  
Author(s):  
Sen Hu ◽  
Tao Fu ◽  
Qihao Liang ◽  
Shayuan Weng ◽  
Xiang Chen ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Critical Stress ◽  
Three Dimensional ◽  
Stacking Faults ◽  
Stacking Fault ◽  
High Entropy Alloy ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Stacking Fault Tetrahedron ◽  
Dynamics Simulations

Stacking fault tetrahedron (SFT) is a kind of detrimental three-dimensional defect in conventional face-centered cubic (FCC) structural metals; however, its formation and anisotropic mechanical behavior in a CoCrFeNiMn high-entropy alloy (HEA) remain unclear. In this work, we first performed molecular dynamics simulations to verify the applicability of the Silcox-Hirsch mechanism in the CoCrFeNiMn HEA. The mechanical responses of the SFT to shear stress in different directions and that of the pure Ni counterpart were simulated, and the evolutions of the atomic structures of the SFTs during shear were analyzed in detail. Our results revealed that the evolution of the SFT has different patterns, including the annihilation of stacking faults, the formation and expansion of new stacking faults, and insignificant changes in stacking faults. It was found that the effects of SFT on the elastic properties of Ni and HEA are negligible. However, the introduction of SFT would reduce the critical stress, while the critical stress of the CoCrFeNiMn HEA is much less sensitive to SFT than that of Ni.

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.

Highly pressurized helium nanobubbles promote stacking-fault-mediated deformation in FeNiCoCr high-entropy alloy

2021 ◽  
pp. 116843
Author(s):  
W.T. Lin ◽  
D. Chen ◽  
C.Q. Dang ◽  
P.J. Yu ◽  
G. Wang ◽  
...  
Keyword(s):  
Stacking Fault ◽  
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.

Interactions Between Screw Dislocation and Twin Boundary in High-Entropy Alloy: A Molecular Dynamic Study

2021 ◽  
Author(s):  
Dan Wu ◽  
Siyao Shuang ◽  
Yanxiang Liang ◽  
Xiaobao Tian ◽  
Guozheng Kang ◽  
...  
Keyword(s):  
Molecular Dynamic ◽  
Screw Dislocation ◽  
Twin Boundary ◽  
Dynamic Study ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Molecular Dynamic Study

Tuning the defects in face centered cubic high entropy alloy via temperature-dependent stacking fault energy

2018 ◽  
Vol 155 ◽  
pp. 134-138 ◽  
Author(s):  
Feng He ◽  
Zhijun Wang ◽  
Qingfeng Wu ◽  
Da Chen ◽  
Tao Yang ◽  
...  
Keyword(s):  
Stacking Fault ◽  
Stacking Fault Energy ◽  
High Entropy Alloy ◽  
Face Centered Cubic ◽  
Temperature Dependent ◽  
High Entropy ◽  
Face Centered

Mechanical Properties and Stacking Fault Energies of NiFeCrCoMn High-Entropy Alloy

JOM ◽  
2013 ◽  
Vol 65 (12) ◽  
pp. 1780-1789 ◽  
Author(s):  
A. J. Zaddach ◽  
C. Niu ◽  
C. C. Koch ◽  
D. L. Irving
Keyword(s):  
Mechanical Properties ◽  
Stacking Fault ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Stacking Fault Energies
Sign in / Sign up

Export Citation Format

Share Document