期刊
SCRIPTA MATERIALIA
卷 172, 期 -, 页码 61-65出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.07.005
关键词
Nanostructured multilayers; Incoherent interfaces; Back stresses; Hardness
类别
资金
- National Key Research and Development Program of China [2017YFB0702301, 2017YFA0700701]
- National Natural Science Foundation of China [51621063, 51722104, 51625103, 51790482, 51761135031, 51571157]
- 111 Project 2.0 of China [BP2018008]
- International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies
- Fok Ying Tong Education Foundation [161096]
- China Postdoctoral Science Foundation [2016M602811, 2017T100744]
- Shaanxi Province Innovative Talents Promotion Projects [2018KJXX-004]
Zr/Mo and Zr/Ti nanostructured multilayers manifest a peak hardness at the critical layer thickness of similar to 10 and similar to 20 nm, respectively. The non-monotonical thickness-dependent hardness is understood in terms of the back stress, which is closely correlated with the dislocation absorption probability by the interfaces. It appears that strength softening occurs as gliding dislocations can be absorbed by interfaces at smaller layer thickness. Furthermore, incoherent interface in the Zr/Mo with discontinuous slip systems is more effective to block dislocation motion than the Zr/Ti with continuous ones, resulting in a higher dislocation storage ability. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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