颜建辉,张孝蹯,汪异,邱敬文

• 1:湖南科技大学材料科学与工程学院
• 2:湖南科技大学高温耐磨材料及制备技术湖南省国防科技重点实验室

摘要(Abstract)：

高比重难熔高熵合金作为一种高温结构材料有较好的应用前景，轻量化设计和抗氧化性能的提高对难熔高熵合金的实际应用非常重要。在高比重WMoNb合金基体中加入金属Cr和Ti元素，设计并制备了一种等摩尔比的WMoNbCrTi高熵合金，并采用固态渗Si在其表面制备了一层多元硅化物涂层。结果表明：以W、Mo、Nb、Cr和Ti粉末为原料，通过机械合金化成功制备了BCC结构的固溶体合金粉末，放电等离子烧结后高熵合金的组织主要由BCC固溶体和Laves相组成。WMoNbCrTi高熵合金的硬度和压缩断裂强度分别为973 HV20和2241 MPa,这主要归因于Laves相的弥散强化、BCC固溶体的固溶强化及其晶粒细化。具有(W, Mo, Nb, Cr, Ti)Si_2多元渗硅层的高熵合金在1200℃氧化100 h后增重仅为0.44 mg·cm~(-2),渗硅层有效改善了WMoNbCrTi高熵合金的抗高温氧化性能，归因于渗硅层表面生成了一层致密连续的氧化膜。

关键词(KeyWords)： WMoNbCrTi高熵合金;等离子烧结;力学性能;渗硅;抗氧化性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52175167);; 湖南省自然科学基金(2020JJ4025)

作者(Author): 颜建辉,张孝蹯,汪异,邱敬文

DOI: 10.13289/j.issn.1009-6264.2021-0561

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