期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.12.060
关键词
High-entropy alloy; Microstructure; Yield strength; Precipitation Strengthening
类别
资金
- National Magnetic Confinement Fusion Science Program of China [2015GB121003]
- National Natural Science Foundation of China [51401071]
The effects of Cu addition on the phase change and mechanical properties of CrMnFeCoNiCux high-entropy alloy were investigated. The results indicated that there was an evolution of phase structure from fccl to fcc2 with the increase of Cu content. The fcc2 was identified to be (Cu, Mn)-rich phase by scanning electron microscopy and transmission electron microscopy. In the alloys with high amount of Cu, Cu-depleted dendrites and (Cu, Mn)-rich inter-dendrites was observed, due to the positive mixing enthalpy between Cu and other elements in the alloy. The yield strength and microhardness increased with increasing Cu content. The yield strength increased from 188.04 MPa for CuO to 350.63 MPa for Cul alloy. The microhardness increased from 165.35 Hv to 215.84 Hv. The high strength of CrMnFeCoNiCu alloy was attributed to the uniformly dispersed nano-size Cu-rich precipitates in the matrix, which impeded the dislocation motion during alloy deformation. The Cu-added CrMnFeCoNiCux alloys also showed excellent strain hardening ability during compression test.
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