期刊
SCRIPTA MATERIALIA
卷 165, 期 -, 页码 112-116出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.02.025
关键词
Helium bubbles; Al-4Cu; Deformability; Bubble coalescence; In situ
类别
资金
- National Key Research and Development Program of China [2017YFB0702301]
- National Natural Science Foundation of China [51471128, 51621063]
- 111 Project of China [BP2018008]
- Innovation Project of Shaanxi Province [2017KTPT-12]
By adopting in situ nano-mechanical testing in transmission electron microscope, we reveal that nanoscale helium bubbles can simultaneously enhance strength and ductility in small-volume single-crystal Al-4Cu pillars, which breaks the paradox of trade-off between strength and ductility. Nanoscale helium bubbles serve as internal dislocation sources and shearable obstacles, which promote dislocation nucleation and storage, and give rise to higher flow stress, controllable plasticity and larger uniform deformation in Al-4Cu pillars. Nanoscale helium bubbles are rather stable under plastic straining. Bubble coarsening and coalescence are only observed at final localized deformation regime. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据