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非等原子比 AlCoCrFeNi 高熵合金组织及 力学性能研究
Research on Microstructure and Mechanical Properties of Non-equiatomic AlCoCrFeNi High-entropy Alloys
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- DOI:
- 作者:
- 李洪超,王 军,赵萌萌,王 毅,李金山
LI Hongchao, WANG Jun, ZHAO Mengmeng, WANG Yi, LI Jinshan
- 作者单位:
- 西北工业大学 凝固技术国家重点实验室
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University
- 关键词:
- 高熵合金; 非等原子比; 力学性能; 组织
high-entropy alloy; non-equal atomic ratio; mechanical properties; microstructure
- 摘要:
- 通过改变 Co 、 Cr 、 Fe 、 Ni 元素含量,研究了铸态非等原子比 Al 0.5 (Co, Cr, Fe, Ni) 4 高熵合金的组织和力学性
能。 结果表明, Cr 元素的增加会提高 bcc 相体积分数,而 Fe 、 Co 、 Ni 元素的增加会提高 fcc 相的体积分数;对于 Co-Fe 、
Co-Ni 、 Fe-Ni 元素含量较高的 Al 0.5 (Co, Cr, Fe, Ni) 4 合金,其 bcc 相中一般析出球状的二次相,而在富 Cr-Ni 、 Co-Cr 元素
的合金中, bcc 相内部分别产生了调幅分解结构和立方体形状的析出相;在铸态 Al 0.5 Co 0.8 Cr 1.2 Fe 1.2 Ni 0.8 合金内部形成了块
状 fcc 相连接而成的层状组织, fcc 相之间分布着 bcc 相,这种独特的组织使其抗拉强度和伸长率分别达到了 1 049 MPa
和 11.2%
The microstructure and mechanical properties of as-cast non-equal atomic ratio Al 0.5 (Co, Cr, Fe, Ni) 4 high
entropy alloy were studied by changing the contents of Co, Cr, Fe and Ni. The results show that the increase of Cr
increases the volume fraction of BCC phase, while the increase of Fe, Co and Ni increases the volume fraction of FCC
phase. For Al 0.5 (Co, Cr, Fe, Ni) 4 alloy with high content of Co-Fe, Co-Ni and Fe-Ni, spherical secondary phase is
precipitated in BCC phase, while for Cr-Ni and Co-Cr alloy, amplitude-modulated decomposition structure and cube-shaped
precipitated phase are generated in BCC phase. Whats more, the layered structure of block fcc interconnections, with bcc
phases distributed between these phases, was formed in the as-cast Al 0.5 Co 0.8 Cr 1.2 Fe 1.2 Ni 0.8 alloy, this unique structure make its
tensile strength and elongation reached 1 049 MPa and 11.2%, respectively.