On the room-temperature tensile deformation behavior of a cast dual-phase high-entropy alloy CrFeCoNiAl0.7
On the room-temperature tensile deformation behavior of a cast dual-phase high-entropy alloy CrFeCoNiAl0.7
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DOI：
10.1016/j.jmst.2021.01.053
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发表时间：
2021-03
影响因子：
10.9
通讯作者：
Qiang Wang;L. Zeng;T. Gao;D. Hui;Xinwang Liu
中科院分区：
文献类型：
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作者：
Qiang Wang;L. Zeng;T. Gao;D. Hui;Xinwang Liu
详细研究了铸造CrFeCoNiAl0.7高熵合金(HEA)的组织和室温拉伸变形行为。铸态HEA由77的双相组织组成。第三卷。%面心立方(Fcc)相+22.7vol.%B2相，表现出优异的室温拉伸性能，屈服强度达876 Mpa，极限拉伸强度达1198 Mpa，断裂伸长率较大，∼为9%。室温拉伸初期塑性变形以面心立方相中的位错滑动为主，随着变形的进行，位错逐渐形成位错壁。当应变进一步增加到较高水平时，层错通过几何必要位错的解离而产生，为形变孪晶提供了潜在的异质形核位置。
The microstructure and room-temperature tensile deformation behavior of the cast CrFeCoNiAl0.7high-entropy alloy (HEA) were studied in details. The cast HEA consisted of a dual-phase structure of 77. 3 vol. % face-centered-cubic (FCC) phase plus 22.7 vol.% B2 phase, and exhibited excellent room-temperature tensile properties with a high yield strength of 876 MPa, ultimate tensile strength of 1198 MPa and a relatively large elongation to fracture of ∼9 %. Dislocations gliding in the FCC phase governed the plastic deformation at the early stage of room-temperature tensile, and disordered dislocations were to form dislocation walls as the deformation proceeded. With further increase in strain to a high level, the stacking faults were generated through the dissociation of the geometrically necessary dislocations, serving as the potential heterogeneous nucleation sites for the deformation twins.