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

许永祥; 方华婵; 段志英; 张茁; 汪家瑜; 朱梦真; 朱凯; 肖鹏

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

粉末冶金材料科学与工程 >

2022 , Vol. 27 >Issue 5: 519 - 531

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

工艺技术

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

许永祥 ,
方华婵 ,
段志英 ,
张茁 ,
汪家瑜 ,
朱梦真 ,
朱凯 ,
肖鹏

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1.中南大学粉末冶金国家重点实验室,长沙 410083;
2.中南大学高等研究中心,长沙 410083

收稿日期: 2022-04-01

修回日期: 2022-06-12

网络出版日期: 2022-11-15

基金资助

国家自然科学青年基金资助项目(51501228)；湖南省自然科学基金资助项目(2015JJ3167)；中南大学大型仪器设备共享基金资助项目(CSUZC202109)；中南大学研究生自主创新项目(1053320192832)

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Microstructure and corrosion properties of Cr and Zr microalloyed ultra-high strength Al-Zn-Mg-Cu-Yb as-cast alloy

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

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1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Advance Research Center, Central South University, Changsha 410083, China

Received date: 2022-04-01

Revised date: 2022-06-12

Online published: 2022-11-15

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摘要

采用铸锭冶金法制备Cr、Zr微合金化Al-Zn-Mg-Cu-Yb合金。通过电化学测试和静置腐蚀实验,结合X射线衍射仪、金相显微镜、扫描电镜和透射电镜研究Cr、Zr微合金化Al-Zn-Mg-Cu-Yb合金中凝固结晶相的析出特征,及其对铸态合金腐蚀行为的影响机理。结果表明：3种铸态Al-Zn-Mg-Cu-Yb合金中的枝晶主要由Al₂CuMg(S相)、Al₈Cu₄Yb和Mg(Zn,Cu,Al)₂(Sigma相)组成,而Cr或Zr的添加导致Sigma相中Cu含量增多,Sigma相电位提高,枝晶与铝基体之间的电位差减小,从而改善了铸态合金的耐腐蚀性能。与Al-Zn-Mg-Cu-Yb和Al-Zn-Mg-Cu-Yb-Cr合金相比,Al-Zn-Mg-Cu-Yb-Zr合金具有更高的耐蚀性,腐蚀形式由沿枝晶腐蚀转变为均匀腐蚀。

关键词： Al-Zn-Mg-Cu-Yb合金; 枝晶偏析; Sigma相; 电位差; 腐蚀性能

本文引用格式

许永祥 , 方华婵 , 段志英 , 张茁 , 汪家瑜 , 朱梦真 , 朱凯 , 肖鹏 . 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[J]. 粉末冶金材料科学与工程, 2022 , 27(5) : 519 -531 . DOI: 10.19976/j.cnki.43-1448/TF.2022041

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

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