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采用ARAMIS三维变形分析测试系统对Zr65Cu20Al10Fe5块体非晶合金在400℃和应变速率为1×10-3s-1条件下的高温拉伸变形行为进行研究,并利用X射线衍射(XRD)对合金试样的显微组织进行分析。结果表明,在变形条件下,该Zr-基非晶合金可表现出良好的塑性,其伸长率为103%,其变形模式为非牛顿流变。用三维变形分析得到的不同变形时刻的应变分布图显示,随着变形量的增加,试样变形变得不均匀,在变形后期会出现颈缩现象。XRD分析结果表明,在拉伸变形过程中,非晶合金试样会发生晶化,其晶化程度与试样不同部位的局部应变量大小有关,局部变形量较大的区域晶化程度较高,而较高含量纳米晶的存在导致了该区域具有较高的变形速率。
The tensile deformation behavior of Zr65Cu20Al10Fe5 bulk amorphous alloy under 400 ℃ and strain rate of 1 × 10-3s-1 was studied by ARAMIS three-dimensional deformation analysis and testing system. X-ray diffraction (XRD) Like microstructure analysis. The results show that under deformation conditions, the Zr-based amorphous alloy can exhibit good ductility, the elongation is 103% and the deformation mode is non-Newtonian. The strain distribution curves at different deformation moments obtained by the three-dimensional deformation analysis show that the deformation of the specimen becomes inhomogeneous with the increase of the deformation amount, and the phenomenon of neck shrinkage occurs at the late stage of deformation. The results of XRD analysis show that during the process of tensile deformation, the amorphous alloy samples will be crystallized, and the degree of crystallization is related to the amount of local strain in different parts of the sample. The degree of crystallization in the region with large local deformation is high , While the higher content of nanocrystals lead to a higher deformation rate in this region.