Microstructure and wear behavior of a refractory high entropy alloy
Microstructure and wear behavior of a refractory high entropy alloy
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DOI：
10.1016/j.ijrmhm.2016.02.006
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发表时间：
2016-06-01
影响因子：
3.6
通讯作者：
Karantzalis, A. E.
中科院分区：
文献类型：
--
作者：
Poulia, A.;Georgatis, E.;Karantzalis, A. E.
研究了等原子成分的高熵耐火Mo20Ta20W20Nb20V20合金的显微组织、硬度和磨损行为。采用真空电弧熔炼的方法制备了该合金，给出了固溶体形成的最佳经验参数。用高能X射线衍射法测定了五元合金的点阵参数a=3.1867埃。合金的维氏显微硬度为HV0.5=7576+/-201 Mpa，而洛氏B硬度为97+/-4HRB。这种合金的特殊硬度大于任何单独的成分，这表明存在一种类似固溶体的强化机制。并对该合金在不同试验条件下的磨损行为进行了研究和分析。测定了磨损量和磨损率，并对磨痕和磨屑进行了扫描电子显微镜和能谱分析，提出了各种情况下可能的磨损机理。最后，将Mo20Ta20W20Nb20V20与工业高温合金Inconel718的磨损行为进行了比较，证明了高熵合金在耐磨性方面的优越性。(C)2016爱思唯尔有限公司。保留所有权利。
The microstructure, hardness and wear behavior of a refractory high-entropy Mo20Ta20W20Nb20V20 alloy of equi-atomic composition were evaluated. The alloy was prepared by vacuum arc melting and presented optimal empirical parameters for the formation of a solid solution phase. The lattice parameter a = 3.1867 angstrom for the quinary alloy was determined with high-energy X-ray diffraction. The alloy's Vickers micro hardness was estimated as HV0.5 = 7576 +/- 201 MPa, while its Rockwell B hardness took a value of 97 +/- 4 HRB. The exceptional hardness in this alloy is greater than any individual constituent, suggesting the operation of a solid-solution-like strengthening mechanism. The alloy's wear behavior was also studied and analyzed under different experimental conditions. The volume loss and wear rate were determined, accompanied by SEM images and EDS analysis of the wear tracks and debris, proposing some possible wear mechanisms for each case. Finally, the wear behavior of Mo20Ta20W20Nb20V20 was compared with that of a commercial superalloy (Inconel 718), proving the supremacy of the high entropy alloy concerning its wear resistance. (C) 2016 Elsevier Ltd. All rights reserved.