A study on severely cold-rolled and intermediate temperature aged HfNbTiZr refractory high-entropy alloy

2020 ◽  
Vol 126 ◽  
pp. 106935
Author(s):  
Chun-Hsiang Tu ◽  
Shyi-Kaan Wu ◽  
Chieh Lin
Keyword(s):  
Intermediate Temperature ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Cold Rolled

scholarly journals Intermediate-Temperature Creep Deformation and Microstructural Evolution of an Equiatomic FCC-Structured CoCrFeNiMn High-Entropy Alloy

Entropy ◽  
2018 ◽  
Vol 20 (12) ◽  
pp. 960 ◽  
Author(s):  
Chengming Cao ◽  
Jianxin Fu ◽  
Tongwei Tong ◽  
Yuxiao Hao ◽  
Ping Gu ◽  
...  
Keyword(s):  
Activation Energy ◽  
Dynamic Recrystallization ◽  
Creep Deformation ◽  
High Stress ◽  
Intermediate Temperature ◽  
Tensile Creep ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Stress Region ◽  
Stress Dependent

The tensile creep behavior of an equiatomic CoCrFeNiMn high-entropy alloy was systematically investigated over an intermediate temperature range (500–600 °C) and applied stress (140–400 MPa). The alloy exhibited a stress-dependent transition from a low-stress region (LSR-region I) to a high-stress region (HSR-region II). The LSR was characterized by a stress exponent of 5 to 6 and an average activation energy of 268 kJ mol−1, whereas the HSR showed much higher corresponding values of 8.9–14 and 380 kJ mol−1. Microstructural examinations on the deformed samples revealed remarkable dynamic recrystallization at higher stress levels. Dislocation jogging and tangling configurations were frequently observed in LSR and HSR at 550 and 600 °C, respectively. Moreover, dynamic precipitates identified as M23C6 or a Cr-rich σ phase were formed along grain boundaries in HSR. The diffusion-compensated strain rate versus modulus-compensated stress data analysis implied that the creep deformation in both stress regions was dominated by stress-assisted dislocation climb controlled by lattice diffusion. Nevertheless, the abnormally high stress exponents in HSR were ascribed to the coordinative contributions of dynamic recrystallization and dynamic precipitation. Simultaneously, the barriers imposed by these precipitates and severe initial deformation were referred to so as to increase the activation energy for creep deformation.

Decomposition kinetics of carbon-doped FeCoCrNiMn high-entropy alloy at intermediate temperature

2020 ◽  
Vol 30 (7) ◽  
pp. 1884-1894 ◽  
Author(s):  
Jian PENG ◽  
Zi-yong LI ◽  
Xin-bo JI ◽  
Yan-le SUN ◽  
Li-ming FU ◽  
...  
Keyword(s):  
Decomposition Kinetics ◽  
Intermediate Temperature ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Carbon Doped ◽  
Kinetics Of

A novel intermediate temperature self-lubricating CoCrCu1-xFeNix high entropy alloy fabricated by direct laser cladding

2021 ◽  
pp. 106857
Author(s):  
Ahmad Ostovari Moghaddam ◽  
Marina N. Samodurova ◽  
Kirill Pashkeev ◽  
Maria Doubenskaia ◽  
Alexey Sova ◽  
...  
Keyword(s):  
Laser Cladding ◽  
Intermediate Temperature ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Direct Laser

Evolution of Guinier-Preston zones in cold-rolled Al0.2CoCrFeNi high-entropy alloy studied by synchrotron small-angle X-ray scattering

2020 ◽  
Vol 769 ◽  
pp. 138526
Author(s):  
Yung-Chien Huang ◽  
Cheng-Si Tsao ◽  
Chieh Lin ◽  
Yi-Cheng Lai ◽  
Shyi-Kaan Wu ◽  
...  
Keyword(s):  
Small Angle ◽  
High Entropy Alloy ◽  
X Ray ◽  
High Entropy ◽  
X Ray Scattering ◽  
Cold Rolled ◽  
Ray Scattering

A multi-phase CrMnFeCoNiAl0.75 high-entropy alloy with high strength at intermediate temperature

2020 ◽  
Vol 120 ◽  
pp. 106744 ◽  
Author(s):  
Lijing Lin ◽  
Xin Xian ◽  
Zhihong Zhong ◽  
Chang Chen ◽  
Zhixiong Zhu ◽  
...  
Keyword(s):  
High Strength ◽  
Intermediate Temperature ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Multi Phase
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