添加Yb对Al-Zn-Mg-Cu-Zr-Cr合金组织性能的影响

doi:10.19976/j.cnki.43-1448/TF.2023021

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Abstract Two kinds of Al-Zn-Mg-Cu alloys adding Zr, Cr elements and Zr, Cr and Yb clements were prepared by the melting and casting method, respectively. Optical microscopy, transmission electron microscopy, and scanning electron microscopy were used to observe the microstructure of these alloys, and mechanical and corrosion properties were also tested. The results show that AlZnMgCu-Zr-Cr-Yb alloy maintains a fibrous structure dominated by small angular grain boundaries after solid solution treatment, which is attributed to the precipitation of a large number of fine and diffuse (Al,Cr)₃(Zr,Yb) phases of 10-20 nm, which can hinder dislocation and grain boundary migration and thus significantly inhibit matrix recrystallisation. The addition of Yb can increase the hardness, strength, elongation, and fracture toughness of the alloy, with the fracture toughness increases from 24.2 MPa·m^1/2 to 32.4 MPa·m^1/2. The resistances to stress corrosion, intergranular corrosion, and exfoliation corrosion all increase at the same time, with the threshold stress intensity factor for stress corrosion cracking (K_ISCC) increases from 10.6 MPa·m^1/2 to 17.0 MPa·m^1/2. The intergranular corrosion depth decreases, the exfoliation susceptibility reduces and the exfoliation grade lowers from EB+ to EA.

Key words： Al-Zn-Mg-Cu alloy recrystallization exfoliation corrosion intergranular corrosion stress corrosion

Received: 20 March 2023 Published: 22 November 2023

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TG146.4

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	DUAN Zhiying
	ZHANG Qianqian
	FANG Zhou
	FANG Huachan
	ZHANG Zhuo
	CHEN Kanghua

Cite this article:

DUAN Zhiying,ZHANG Qianqian,FANG Zhou, et al. Effects of Yb addition on microstructure and properties of Al-Zn-Mg-Cu-Zr-Cr alloy[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(5): 413-426.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2023021 OR http://pmbjb.csu.edu.cn/EN/Y2023/V28/I5/413

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