Microstructure and mechanical properties of Cu-Be/Cu-Zn laminated composite after solution and aging treatment

doi:10.13251/j.issn.0254-6051.2020.11.009

Abstract

Abstract: Cu-Be/Cu-Zn laminated composites were prepared by vacuum hot pressing, cold rolling and subsequent heat treatment. The phase and microstructure of the composite under different heat treatment conditions were investigated by means of XRD, OM, SEM and EDS. The mechanical properties of the composite were tested and analyzed. The results show that the main phases of the Cu-Be/Cu-Zn laminated composite under the solid solution state and aging state are Cu_0.7Zn_0.3 phase and Cu phase, and there is a little CuBe phase in the laminated composite under the aging state. The grain size of the laminated composite under both heat treatment conditions presents the bimodal distribution and the grain size of the Cu-Zn layers is about three times of that of the Cu-Be layers. After the same solid solution and aging treatment, the ultimate tensile strength of the Cu-Be/Cu-Zn laminated composite is 857 MPa, which is lower than that of the Cu-Be alloy by 23.0%. However, the uniform elongation of the laminated composite reaches 15.3%, which is 4.7 times higher than that of the Cu-Be alloy. According to KME model, the dislocation dynamic recovery rate of the Cu-Be/Cu-Zn laminated composite is much lower than that of the Cu-Be alloy during plastic deformation, resulting in a significant improvement of the strain hardening capacity of the material, which is the main reason for the high strength and ductility of the Cu-Be/Cu-Zn laminated composite.

Key words: Cu-Be/Cu-Zn laminated composite, solid solution and aging treatment, microstructure, mechanical properties, strain hardening

CLC Number:

TG146.1⁺1

Tang Yanchuan, Xu Juwen, Zhang Xinlei, Cui Zeyun, Wang Wenhui. Microstructure and mechanical properties of Cu-Be/Cu-Zn laminated composite after solution and aging treatment[J]. Heat Treatment of Metals, 2020, 45(11): 43-48.

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