Annealing-induced abnormal hardening in a cold rolled CrMnFeCoNi high entropy alloy

2019 ◽  
Vol 162 ◽  
pp. 345-349 ◽  
Author(s):  
Ji Gu ◽  
Min Song
Keyword(s):  
High Entropy Alloy ◽  
High Entropy ◽  
Cold Rolled

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

scholarly journals The Effect of Zr Addition on Melting Temperature, Microstructure, Recrystallization and Mechanical Properties of a Cantor High Entropy Alloy

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5994
Author(s):  
Enrico Gianfranco Campari ◽  
Angelo Casagrande ◽  
Elena Colombini ◽  
Magdalena Lassinantti Gualtieri ◽  
Paolo Veronesi
Keyword(s):  
Mechanical Properties ◽  
Melting Temperature ◽  
Recrystallization Temperature ◽  
Vacuum Induction Melting ◽  
High Entropy Alloy ◽  
Second Phase ◽  
Induction Melting ◽  
High Entropy ◽  
Zr Addition ◽  
Cold Rolled

The effect of Zr addition on the melting temperature of the CoCrFeMnNi High Entropy Alloy (HEA), known as the “Cantor’s Alloy”, is investigated, together with its micro-structure, mechanical properties and thermomechanical recrystallization process. The base and Zr-modified alloys are obtained by vacuum induction melting of mechanically pre-alloyed powders. Raw materials are then cold rolled and annealed. recrystallization occurred during the heat treatment of the cold-rolled HEA. The alloys are characterized by X-ray diffraction, electron microscopy, thermal analyses, mechanical spectroscopy and indentation measures. The main advantages of Zr addition are: (1) a fast vacuum induction melting process; (2) the lower melting temperature, due to Zr eutectics formation with all the Cantor’s alloy elements; (3) the good chemical alloy homogeneity; and (4) the mechanical properties improvement of re-crystallized grains with a coherent structure. The crystallographic lattice of both alloys results in FCC. The Zr-modified HEA presents a higher recrystallization temperature and smaller grain size after recrystallization with respect to the Cantor’s alloy, with precipitation of a coherent second phase, which enhances the alloy hardness and strength.

scholarly journals Effect of heat treatment on the microstructure and hardness of Al0.3CoCrFeNi high entropy alloy

2021 ◽  
Vol 2076 (1) ◽  
pp. 012085
Author(s):  
Hailin Zhai ◽  
Siyi Zhang ◽  
Dong Yang ◽  
Chenxue Wang ◽  
Jishen Jiang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Grain Refinement ◽  
Annealed Sample ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
Rolled Sample ◽  
High Entropy ◽  
Heat Treated ◽  
Cold Rolled

Abstract In this study, the cold-rolled Al0.3CoCrFeNi high entropy alloys were heat treated at 900°C for 30min and 1050°C for 20min, respectively, to investigate the effect of heat treatment on the microstructure of the alloy. The results showed that grain refinement occurred in the 900°C/30min annealed sample, while remarkable equiaxial grains and twins appeared in the 1050°C/20min annealed sample. The hardness of samples showed a decrease trend following: as-rolled sample, 900°C/30min annealed sample, and 1050°C/20min annealed sample, which can be attributed to the dislocation elimination caused by recovery and recrystallization.

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