Microstructure and mechanical properties of friction stir welding joint of Cu-Cr-Zr alloy

doi:10.13251/j.issn.0254-6051.2020.03.008

Abstract

Abstract:

Friction stir welding (FSW) was conducted on Cu-Cr-Zr alloy plates with 3 mm thickness by using rotation speed of 750 and 1500 r/min and welding speed of 23.5 mm /min, in the state of aged and solid solution treated respectively. The effects of rotation speed and base metal (BM) initial state on the microstructure and mechanical properties of the FSW joints were studied, and the mechanical properties of joints were modeled and quantitatively analyzed. The results show that the grain size of the FSW joint significantly refines, and the precipitated phase is dissolved in the matrix under the high-temperature effect of the stir-welding head. When the initial state of BM is aged state, compared with the specimens of 1500 r/min, the grain size of the 750 r/min specimens is smaller, and there exists precipitate phase in the matrix, so that the 750 r/min specimens have higher mechanical properties mainly due to the comprehensive effect of grain boundary strengthening and precipitation strengthening. When the initial state of BM is solid solution state, compared with the specimens of 1500 r/min, the 750 r/min specimens have smaller grain size and high mechanical properties mainly due to grain boundary strengthening effect. When the FSW speed is the same, the welding joint grain size of the aged state is smaller than that of solid solution state, but the mechanical properties of the aged state is higher than that of solid solution state, which is mainly due to the difference of the initial state microstructures. The comprehensive analysis shows that a welding joint with better performance can be obtained by the FSW process with a lower welding speed.

Key words: Cu-Cr-Zr alloy, friction stir welding, microstructure, mechanical properties

CLC Number:

TG456.5

Zhou Sha, Wang Kuaishe, Wang Wen, Peng Pai, Zhang Shengyi, Huang Liying. Microstructure and mechanical properties of friction stir welding joint of Cu-Cr-Zr alloy[J]. HTM, 2020, 45(3): 35-40.

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