期刊
SCRIPTA MATERIALIA
卷 145, 期 -, 页码 99-103出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2017.10.019
关键词
Gradient nanograin (GNG); Cu; Cyclic deformation; Abnormal grain coarsening; Extrusions/intrusions
类别
资金
- National Science Foundation of China [51371171, 51471172, 51420105001, U1608257]
- key Research program of Frontier Science, CAS
Microstructural evolution of gradient nanograined (GNG) Cu was investigated under strain-controlled cyclic deformation. Mechanically driven abnormal grain coarsening initiated from the ultrafine grained subsurface layer and eventually extended to the nanograined top surface with increasing cycles. Abnormal grain coarsening and the formation of dislocation patterns sustain the cyclic plastic strain and postpone the formation of extrusions/intrusions at the top surface, contributing to the enhancement of overall cyclic properties of GNG Cu. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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