Microstructure and mechanical properties of CoCrCuFeNiTi0.8 high-entropy alloy prepared by directional solidification

被引：0
|
作者：
Xu Y.-K. [1 ]
Li C.-L. [1 ]
Huang Z.-H. [1 ]
Chen Y.-N. [1 ]
Zhu L.-X. [2 ]
机构：
[1] School of Material Science and Engineering, Chang'an University, Xi'an
[2] CNPC Tubular Goods Research Institute, Xi'an
来源：
Xu, Yi-Ku (xuyiku23@chd.edu.cn) | 1600年 / Central South University of Technology卷 / 31期
基金：
上海市自然科学基金;
关键词：
Directional solidification; High-entropy alloy; Mechanical behavior; Primary dendrite arm spacing;
D O I：
10.11817/j.ysxb.1004.0609.2021-36593
中图分类号：
学科分类号：
摘要：
The CoCrCuFeNiTi0.8 high-entropy alloy was prepared by directional solidification technology. The effects of different withdrawal rates (5 μm/s, 10 μm/s, 25 μm/s) on the microstructure and mechanical properties of the alloy were studied. The microstructures of the alloy were analyzed by optical microscope, and the phase composition of the alloy was determined by X-ray diffraction and transmission electron microscope. The results show that the microstructure of the alloy is dendritic at all withdrawal rates, the dendrite orientation tends to be uniform as the solidification process goes on. When the withdrawal rates increase from 5 μm/s to 25 μm/s, the dendrite diameter decrease from 469.70 μm to 355.48 μm, and the fractal dimension increases from 1.5981 to 1.6158. The dendrite structure is obviously refined with the increase of withdrawal rate to 25 μm/s. Moreover, the maximum compressive strength reaches 1440.19 MPa and the maximum plastic strain is 11.98%, which prove that the directional solidification technology can effectively improve the mechanical properties of the CoCrCuFeNiTi0.8 high-entropy alloy. © 2021, Science Press. All right reserved.
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页码：1494 / 1504
页数：10
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