林应征,杨洪宇,陈芳,颜建辉

• 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)：

WMoNbCrTi高熵合金是一种极具应用潜力的高温结构材料，添加Si有望提高其综合力学性能。以高能球磨粉末为原料，采用放电等离子烧结技术制备了WMoNbCrTiSi_x(x=0、0.1、0.25和0.5)高熵合金，研究Si含量对其微观组织和力学性能的影响。结果表明：加入Si后高熵合金的组织由BCC固溶体、Laves相和硅化物组成。当x=0.1时，Si主要形成Ti_5Si_3,当x=0.25时，大部分Si与Ti形成Ti_5Si_3,少部分Si与Nb形成Nb_3Si,当x=0.5时，Si主要形成Ti_5Si_3、Nb_3Si和Cr_3Si。当x从0增加到0.5时，WMoNbCrTiSi_x高熵合金的硬度由9.84 GPa增加到13.46 GPa,断裂韧性从6.68 MPa·m~(1/2)下降到4.72 MPa·m~(1/2)。WMoNbCrTiSi高熵合金中的硅化物提高了硬度，降低了断裂韧性。当x从0增加到0.5时，最大压缩应变由9.1%提高到13.2%,压缩断裂强度由1758 MPa提高到2448 MPa,这主要是由于晶粒细化和硅化物的共同作用所致。

关键词(KeyWords)： WMoNbCrTi高熵合金;Si;力学性能

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);; 湖南省教育厅项目(22C0259)

作者(Author): 林应征,杨洪宇,陈芳,颜建辉

DOI: 10.13289/j.issn.1009-6264.2023-0062

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