Cr、Zr微合金化超高强Al-Zn-Mg-Cu-Yb铸态合金的组织及腐蚀性能

doi:10.19976/j.cnki.43-1448/TF.2022041

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Abstract Cr and Zr microalloyed Al-Zn-Mg-Cu-Yb alloys were prepared by ingot metallurgy. The precipitation characteristics of solidified crystalline phase in Cr or Zr microalloyed Al-Zn-Mg-Cu-Yb alloys and its influence mechanism on the corrosion behavior of the as-cast alloys were studied by electrochemical test and static corrosion experiment, combined with the observation and analysis of X-ray diffraction, optical microscope, scanning electron microscope and transmission electron microscope. The results show that the dendrites of the three as-cast Al-Zn-Mg-Cu-Yb alloys are mainly composed of Al₂CuMg (S phase), Al₈Cu₄Yb and Mg(Zn,Cu,Al)₂ (Sigma phase). The addition of Cr or Zr leads to the increase of Cu content in Sigma phase, the increase of potential of Sigma phase and the decrease of potential difference between dendrites and aluminum matrix, which can improve the corrosion properties of the as-cast alloys. Compared with Al-Zn-Mg-Cu-Yb and Al-Zn-Mg-Cu-Yb-Cr alloys, Al-Zn-Mg-Cu-Yb-Zr alloy has higher corrosion resistance, and the corrosion form changes from intergranular corrosion to uniform corrosion.

Key words： Al-Zn-Mg-Cu-Yb alloy dendrite segregation Sigma phase potential difference corrosion property

Received: 01 April 2022 Published: 15 November 2022

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TG146.21

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	XU Yongxiang
	FANG Huachan
	DUAN Zhiying
	ZHANG Zhuo
	WANG Jiayu
	ZHU Mengzhen
	ZHU Kai
	XIAO Peng

Cite this article:

XU Yongxiang,FANG Huachan,DUAN Zhiying, et al. Microstructure and corrosion properties of Cr and Zr microalloyed ultra-high strength Al-Zn-Mg-Cu-Yb as-cast alloy[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(5): 519-531.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2022041 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I5/519

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