期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.08.078
关键词
Nanocrystalline; Mechanical properties; Strain rate; Dislocation; Grain boundary
类别
资金
- National Natural Science Foundation of China [51371089, 51401083]
- State Key Laboratory for Mechanical Behavior of Materials [20121205]
Tensile properties of an electric brush-plated nanocrystalline Cu with an average grain size of 59 nm were investigated at different strain rates. This nanocrystalline Cu exhibits an excellent combination of strength and ductility with its ultimate tensile strength increasing from 635 MPa to 1000 MPa and total elongation decreasing from 15.8% to 9.9% as strain rate increases from 10(-4) s(-1) to 1 s(-1). Analysis based on the characterization results of transmission electron microscopy (TEM), scanning electron microscopy (SEM) and general area detector diffraction detection system (GADDS) on the as-brush-plated and deformed NC specimens revealed that the excellent combination of strength and ductility arises from the enhanced dislocation strain hardening ability and the improved deformation accommodation role played by GB sliding. (C) 2014 Elsevier B.V. All rights reserved.
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