Enhance the properties of CuCr alloy by constructing Gr@Cr core-shell structure

•Gr@Cr was designed and prepared by a dopamine self-polymerization process.•Gr/CuCr25 with Gr@Cr core-shell structure was prepared by arc melting.•The Cr phase size of Gr/CuCr25 decreases compared with CuCr25.•Hardness and conductivity increase simultaneously in Gr/CuCr25. In this work, the core-she...

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Bibliographic Details
Published in:Materials letters 2021-03, Vol.286, p.129238, Article 129238
Main Authors: Dong, Yunfan, Leng, Jinfeng, Ren, Binghui, Xu, Xianglei, Xia, Changpeng
Format: Article
Language:English
Subjects:
Arc melting
Brinell hardness
Copper base alloys
Core-shell structure
Dopamine
Electric arc melting
Electric contacts
Electrical properties
Electrical resistivity
Elongation
Gr/CuCr
Graphene
Materials science
Microstructure
Nucleation
Shells
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Summary:•Gr@Cr was designed and prepared by a dopamine self-polymerization process.•Gr/CuCr25 with Gr@Cr core-shell structure was prepared by arc melting.•The Cr phase size of Gr/CuCr25 decreases compared with CuCr25.•Hardness and conductivity increase simultaneously in Gr/CuCr25. In this work, the core-shell (Gr@Cr) structure was synthesized by self-polymerization of dopamine and then, Gr/CuCr25 (graphene/CuCr25 (25 wt% Cr)) composites were prepared by arc melting process. The results show that the Brinell hardness of the composite increases from 97.5% to 104.5, and the electrical conductivity increases from 42.6% IACS to 49.1% IACS compared with CuCr25 alloy. Because of the core-shell structure of Gr/CuCr25 composite, the Cr phase coated with graphene is hindered by graphene during nucleation and elongation, so that the number of dendritic Cr phase decreases and the number of dispersed equiaxed grains increases, which improves the comprehensive properties of CuCr electrical contact materials.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2020.129238