Microstructure Evolution and Mechanical Properties of Rapid Solidified AlCoCrFeNi2.1 Eutectic High Entropy Alloy

被引：0

作者：

Cao L. ^{[1
]}

Zhu L. ^{[1
]}

Zhang L. ^{[1
]}

Wang H. ^{[2
]}

Cui Y. ^{[1
]}

Yang Y. ^{[1
]}

Liu F. ^{[1
]}

机构：

[1] School of Mechanical and Materials Engineering, North China University of Technology, Beijing

[2] State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing

来源：

Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2019年 / 33卷 / 09期

关键词：

Eutectic high entropy alloy; Metallic materials; Microstructure; Rapid solidification;

D O I：

10.11901/1005.3093.2019.069

中图分类号：

学科分类号：

摘要：

Rods with different diameters and ribbons of the multi-component eutectic high-entropy alloy AlCoCrFeNi2.1 were prepared by vacuum rapid solidification facility. The effect of cooling rate on microstructure and mechanical properties of the alloy was investigated. The results show that all of the alloys consist of FCC and B2 phases. Alloy rods of different diameters present a typical eutectic structure, with the presence of the cellular microstructure at certain sites of axial surface regions. The decrease of the diameter raises the cooling rate of the casting rod, resulting in the decrease of lamellar spacing (λ) of the regular eutectic structure and the increase of yield strength. As the diameter decreases from 8 mm to 2 mm, the values of λ decrease from 530.4 to 357.0 μm in the axial surface regions and from 712.0 μm to 474.0 μmin the axial center regions, resulting in the increase of the yield strength from 690 MPa to 877 MPa. As far as the microstructure morphology of the alloy ribbons is concerned, it can be concluded that the microstructure of the alloy may evolves in the following sequence, namely, regular and irregular eutectic structure, cellular structure and dendrite structure as the cooling rate is increased. © All right reserved.

引用

页码：650 / 658

页数：8

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