Strengthening FCC-CoCrFeMnNi high entropy alloys by Mo addition |
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Authors: | Gang Qin Ruirun Chen Huiting Zheng Hongze Fang Liang Wang Yanqing Su Jingjie Guo Hengzhi Fu |
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Affiliation: | 1. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, China;2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China |
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Abstract: | In order to strengthen the face-centered-cubic (FCC) type CoCrFeMnNi high entropy alloys (HEAs), different contents of Mo (0–16?at.%, similarly hereinafter) were alloyed. Phase evolution, microstructure, mechanical properties and related mechanism of these HEAs were systematically studied. The results show that sigma phase is appeared with addition of Mo, and the volume fraction of it increases gradually from 0 to 66% with increasing Mo content. It is found that Mo is enriched in sigma phase, which indicates that Mo element is beneficial to form sigma phase. Compressive testing shows that the yield strength of the alloys increases gradually from 216 to 765 MPa, while the fracture strain decreases from 50% (no fracture) to 19% with increasing of Mo. The alloy exhibits the best compressive performance when Mo content reaches 11%, the yield strength, fracture strength and fracture strain are 547 MPa, 2672 MPa and 44% respectively. The increased volume fraction of sigma phase plays an important role in improving the compressive strength of (CoCrFeMnNi)100-xMox HEAs. |
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Keywords: | High-entropy alloys Mo element Phase transition Mechanical properties Valence electron concentration |
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