期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.144328
关键词
Cu-Cr-Zr-Si alloy; Recrystallization; Strengthening mechanism; High -temperature softening resistance; Microstructure; Properties
类别
资金
- National Key Research and Develop- ment Program of China
- National Natural Science Foundation of China
- Natural Science Foundation of Hebei Province
- Natural Science Foundation of Beijing
- science and technology innovation project of Ningbo
- [2018YFE0306103]
- [52071050]
- [51871041]
- [51690163]
- [52001121]
- [E2022502004]
- [2214079]
- [2021Z084]
- [2021Z051]
By investigating the influence mechanism of different alloy compositions on high-temperature softening resistance, a new copper alloy was designed and manufactured to improve its high-temperature softening resistance and mechanical properties.
It is urgent to develop new copper alloys for future fusion reactors (e.g. DEMO and CFETR). This work involved the design and fabrication of an alloy, Cu-0.8Cr-0.12Zr-(0.05Si), with increasing high-temperature softening resistance by thermo-mechanical treatment. The influence mechanism of Si on its mechanical properties and softening resistance at high temperature was investigated. The peak-aged Cu-Cr-Zr alloy containing Si exhibits higher ultimate tensile strength of 622 MPa, yield strength of 588 MPa with a considerable elongation of 17% and electrical conductivity of 76% IACS. The dislocation and Orowan strengthening trigged for finer Cr precipitates are proven to be the main reasons for the improvement in strength. Moreover, the increase in elongation originates from the deformation twins due to the lower stacking fault energy, as confirmed by the first principles. Meanwhile, the addition of Si can significantly improve the high-temperature softening resistance of the alloy. The main reason is that the growth of Cr precipitates is suppressed by adding Si, and its pinning effect on the boundary is better, thereby inhibiting the occurrence of recrystallization.
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