期刊
NANO LETTERS
卷 16, 期 7, 页码 4118-4124出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b00864
关键词
Radiation damage; He bubble; ductility; in situ TEM; submicron-sized
类别
资金
- National Natural Science Foundation of China [51471128, 51231005, 51321003]
- Youth Thousand Talents Program of China
- Young Talent Support Plan of XJTU
- ESISM Japan
- JSPS KAKENHI [22102003, 23246025, 25630013]
- NSF [DMR-1410636, DMR-1120901]
- Grants-in-Aid for Scientific Research [23246025] Funding Source: KAKEN
The workability and ductility of metals usually degrade with exposure to irradiation, hence the phrase radiation damage. Here, we found that helium (He) radiation can actually enhance the room-temperature deform ability of submicron-sized copper. In particular, Cu single crystals with diameter of 100-300 nm and containing numerous pressurized sub-10 nm He bubbles become stronger, more stable in plastic flow and ductile in tension, compared to fully dense samples of the same dimensions that tend to display plastic instability (strain bursts). The sub-10 nm He bubbles are seen to be dislocation sources as well as shearable obstacles, which promote dislocation storage and reduce dislocation mean free path, thus contributing to more homogeneous and stable plasticity. Failure happens abruptly only after significant bubble coalescence. The current findings can be explained in light of Weibull statistics of failure and the beneficial effects of bubbles on plasticity. These results shed light on plasticity and damage developments in metals and could open new avenues for making mechanically robust nano- and microstructures by ion beam processing and He bubble engineering.
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