期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.02.006
关键词
Ultrafine grained copper matrix; nanocomposites; Tensile ductility; Strain rate sensitivity; Deformation mechanisms
类别
资金
- National Natural Science Foundation of China [51271115]
- Ministry of Science and Technology, China [201203619600]
In this study, we observed a strong strain rate dependence of tensile ductility for an ultrafine grained Cu-5vol% Al2O3 nanocomposite prepared by powder compact extrusion. This dependency of tensile ductility of the material to strain rate, combined with detailed materials characterization, suggests that the strain at which nearly ideal plastic deformation occurs is associated with the magnitude of the flow stress. The measured apparent activation volume and observed alignment of Cu grains suggest that plastic deformation during this nearly perfect deformation stage is dominated by the co-operative grain boundary sliding.
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