材料科学
微观结构
合金
尼亚尔
断裂韧性
复合材料
高熵合金
应变硬化指数
加工硬化
旋节分解
冶金
应变率
金属间化合物
相(物质)
化学
有机化学
作者
Ziyan Li,Xiaohong Wang,Yanyan Huang,Zhixin Xu,Yulei Deng,Xiaoying Jiang,Yang Xiao-hong
出处
期刊:Coatings
[Multidisciplinary Digital Publishing Institute]
日期:2023-10-06
卷期号:13 (10): 1737-1737
被引量:6
标识
DOI:10.3390/coatings13101737
摘要
Based on the excellent comprehensive mechanical properties of high–entropy alloy (HEA), the NiAl-based HEA was designed to achieve excellent high-temperature strength, toughness, and wear resistance. In this work, vacuum arc melting technology was used to prepare (NiA1)78(CoCrFe)16.5Cu5.5 HEA, and its microstructure, phase composition, and mechanical properties were systematically studied. The results showed that (NiA1)78(CoCrFe)16.5Cu5.5 HEA was composed of FCC and BCC/B2, with a spinodal decomposition structure in the matrix, and nano-precipitation in the interdendritic, exhibiting a good high-temperature performance. At 600 °C, the compressive fracture strength is 842.5 MPa and the fracture strain is 24.5%. When the temperature reaches 800 °C, even if the strain reaches 50%, the alloy will not fracture, and the stress–strain curve shows typical work hardening and softening characteristics. The wear coefficient of the alloy first increases and then decreases with the increase in temperature in the range of room temperature to 400 °C. However, the specific wear rate shows the opposite trend. At 100 °C, the wear rate reaches the lowest of 7.05 × 10−5 mm3/Nm, and the wear mechanism is mainly abrasive wear.
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