文章基本信息

标题：Micro-deformation behavior in micro-compression with high-purity aluminum processed by ECAP
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作者：Jie Xu ; Chenxi Wang ; Debin Shan 等
期刊名称：Manufacturing Review
印刷版ISSN：2265-4224
电子版ISSN：2265-4224
出版年度：2015
卷号：2
页码：1
DOI：10.1051/mfreview/2015003
语种：English
出版社：EDP Sciences
摘要：Ultrafine-grained (UFG) materials have a potential for applications in micro-forming since grain size appears to be the dominant factor which determines the limiting size of the geometrical features. In this research, high-purity Al was processed by equal-channel angular pressing (ECAP) at room temperature through 1–8 passes. Analysis shows that processing by ECAP produces a UFG structure with a grain size of ~1.3 μm and with microhardness and microstructural homogeneity. Micro-compression testing was carried out with different specimen dimensions using the annealed sample and after ECAP processing through 1–8 passes. The results show the flow stress increases significantly after ECAP processing by comparison with the annealed material. The flow stress generally reaches a maximum value after 2 passes which is consistent with the results of microhardness. The flow stress decreases with decreasing specimen diameter from 4 mm to 1 mm which demonstrates that size effects also exist in the ultrafine-grained materials. However, the deformation mechanism in ultrafine-grained pure Al changes from strain strengthening to softening by dynamic recovery by comparison with the annealed material.
关键词：micro-deformation; aluminum; ECAP; micro-forming; ultrafine grains