Dry sliding wear behavior of laser clad TiVCrAlSi high entropy alloy coatings on Ti-6Al-4V substrate
Dry sliding wear behavior of laser clad TiVCrAlSi high entropy alloy coatings on Ti-6Al-4V substrate
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DOI：
10.1016/j.matdes.2012.04.049
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发表时间：
2012-10-01
影响因子：
8.4
通讯作者：
Shen, Jianyun
中科院分区：
文献类型：
--
作者：
Huang, Can;Zhang, Yongzhong;Shen, Jianyun
采用激光熔覆技术在Ti-6Al-4V合金表面制备了等摩尔比的TiVCrAlSi高熵合金涂层。通过扫描电子显微镜（SEM）对涂层的微观结构进行了分析，结果表明涂层与基体之间形成了牢固的结合。X射线衍射（XRD）和能谱（EDS）分析表明，TiVCrAlSi涂层由（Ti，V）（5）Si-3析出相弥散分布在体心立方（BCC）基体中。金属间化合物（Ti，V）5Si 3的形成是因为伴随着较大的焓变化，这可能抵消了熵项。干滑动磨损试验表明，激光熔覆TiVCrAlSi可提高Ti-6Al-4V的耐磨性。的耐磨性的增强被解释的存在下，分散在一个相对韧性BCC矩阵，这使得滑动磨损发生在温和的氧化制度的广泛的测试条件下的硬硅化物相。(C)2012爱思唯尔有限公司保留所有权利。
Approximately equimolar ratio TiVCrAlSi high entropy alloy coatings has been deposited by laser cladding on Ti-6Al-4V alloy. The analysis of the microstructure by scanning electron microscopy (SEM) shows that the coating is metallurgically bonded to the substrate. X-ray diffraction (XRD) and energy dispersive spectrometer (EDS) analyses show that TiVCrAlSi coating is composed of precipitates of (Ti,V)(5)Si-3 dispersed in a body-centered cubic (BCC) matrix. Intermetallic compound (Ti, V) 5Si3 forms because the formation is accompanied by larger variation on enthalpy, which may offset the entropy term. The dry sliding wear tests show that the wear resistance of Ti-6Al-4V is improved by laser cladding with TiVCrAlSi. The enhancement of the wear resistance is explained by the presence of the hard silicide phase dispersed in a relatively ductile BCC matrix, which allows sliding wear to occur in the mild oxidative regime for a wide range of testing conditions. (C) 2012 Elsevier Ltd. All rights reserved.