Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 628, Issue -, Pages 62-74Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.01.015
Keywords
Grain growth; Twinning/detwinning; Boundary; Dislocation; Strain rate sensitivity; Size effect
Categories
Funding
- National Natural Science Foundation of China [51321003, 51322104, 51201123]
- 973 Program of China [2010CB631003]
- 111 Project of China [B06025]
- Fundamental Research Funds for the Central Universities
- Tengfei Scholar Project
- China Postdoctoral Science Foundation [2012M521765]
- Shaanxi Province Postdoctoral Scientific Research Projects
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Both twinning and its reversible process, i.e., detwinning, play important roles in crystalline plasticity, especially for nanostructured metals and alloys. Contrary to the popular belief that the nanotwinned (NT) microstructure is quite stable, in this work, we reported the twinning/oletwinning-mediated grain growth (GG) and dislocation nucleation-controlled strength softening in the high stacking fault energy (SFE) NT-Ni foils with different grain sizes but nearly identical twin lamellar thickness during tension at room temperature. We further proposed two possible dislocation-boundary interaction mechanisms that cause GG via twinning/detwinning processes, and elucidated strain rate effect on the double-inverse grain size dependence of twinning/detwinning in nanostructured Ni samples. Our findings provide indepth insights into the manipulation of internal features of metals and alloys with high SFE to achieve optimum robust performance for practical applications and fundamental understanding of the twinning/ detwinning behavior of NT-materials to predict their stability and evolution of microstructures. (C) 2015 Elsevier B.V. All rights reserved.
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