张来启,黄永安,黄蕾,林均品

• 1:北京科技大学新金属材料国家重点实验室

摘要(Abstract)：

分析了载荷对Mo_5SiB_2合金压痕裂纹影响规律,观察了压痕裂纹形貌特征,表征了裂纹长度与载荷的关系,确定了压痕裂纹系统,选取不同的压痕方程计算了室温断裂韧性KIC值,探讨了压痕载荷以及压痕方程对KIC值的影响关系。结果表明,Mo_5SiB_2合金压痕裂纹系统属于中位裂纹,只要选择合适的压痕方程,载荷并不影响断裂韧性值。压痕法测定Mo_5SiB_2合金断裂韧性合适的经验方程为KIC=0.8193H~(0.5)E~(0.5)a~2c~(-1.5),测得的其KIC值为2.63 MPa·m~(1/2)。

关键词(KeyWords)： Mo_5SiB_2;合金;压痕法;断裂韧性;经验方程

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(50871012)

作者(Author): 张来启,黄永安,黄蕾,林均品

DOI: 10.13289/j.issn.1009-6264.2017.01.029

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