Al-8.0Zn-2.0Mg-2.1Cu合金均匀化过程中Al2CuMg相的消除

doi:10.13251/j.issn.0254-6051.2020.05.008

金属热处理 ›› 2020, Vol. 45 ›› Issue (5): 40-44.DOI: 10.13251/j.issn.0254-6051.2020.05.008

Al-8.0Zn-2.0Mg-2.1Cu合金均匀化过程中Al₂CuMg相的消除

朱鹏程^1,2, 姜丽军², 向康宁², 黄杰², 姚丹², 余鑫祥^1,2

1. 烟台南山学院南山集团博士后工作站, 山东烟台 265713;
2. 烟台南山学院先进轻合金材料与器件实验室, 山东烟台 265713

收稿日期:2019-10-14 出版日期:2020-05-25 发布日期:2020-09-02
通讯作者: 余鑫祥,副教授,博士,E-mail:xxyucn@qq.com
作者简介:朱鹏程(1974—),男,副教授,主要研究方向为材料加工性能与微观组织,E-mail:95711379@qq.com。
基金资助:
山东省高等学校科技计划项目(J18KA053);龙口市科技研发计划项目(2017GG23)

Elimination of Al₂CuMg phase during homogenization in Al-8.0Zn-2.0Mg-2.1Cu alloy

Zhu Pengcheng^1,2, Jiang Lijun², Xiang Kangning², Huang Jie², Yao Dan², Yu Xinxiang^1,2

1. Postdoctoral Workstation of Nanshan Group Co., Ltd., Yantai Nanshan University, Yantai Shandong 265713, China;
2. Laboratory of Advanced Light Alloy Materials and Devices, Yantai Nanshan University, Yantai Shandong 265713, China

Received:2019-10-14 Online:2020-05-25 Published:2020-09-02

摘要/Abstract

摘要： 采用光学显微镜(OM)、扫描电镜(SEM)、电子探针显微分析(EPMA)、X射线衍射(XRD)以及差示扫描量热仪(DSC)研究了一种高合金化Al-8.0Zn-2.0Mg-2.1Cu(wt%)合金在均匀化过程中难溶相Al₂CuMg的形成以及实现其充分溶解的工艺。结果表明:铸态时,合金中主要的非平衡凝固相为Mg(Zn, Al, Cu)₂相,Zn、Mg、Cu元素偏聚严重。经过470 ℃×40 h一级均匀化后,虽然Mg(Zn, Al, Cu)₂相逐渐回溶至基体中促进了合金中枝晶网络的基本消除,但合金中形成了一种耐高温的有害相Al₂CuMg。进一步采用485 ℃×14 h的高温均匀化工艺实现了合金中耐高温相Al₂CuMg的充分回溶。扩散动力学分析表明,470 ℃×40 h+485 ℃×14 h的双级均匀化工艺足以使合金中的非平衡相回溶至基体中。

关键词: Al-Zn-Mg-Cu合金, 均匀化, 相转变, 微观组织

Abstract: The formation of the insoluble phase Al₂CuMg in a highly alloyed Al-8.0Zn-2.0Mg-2.1Cu (wt%) alloy during homogenization and the process of its full dissolution were studied by means of OM、SEM、EPMA、XRD and DSC. The results show that the main non-equilibrium solidification phase in as-cast alloy is Mg (Zn, Al, Cu)₂ phase, and the elements of Zn, Mg and Cu are segregated seriously. After primary homogenization of heating at 470 ℃ for 40 h, although Mg (Zn, Al, Cu)₂ phase gradually is dissolved back into the matrix and promotes the elimination of dendritic network in the alloy, a harmful phase Al₂CuMg with high temperature stablity is formed in the alloy. Furthermore, the high temperature homogenization process of heating at 485 ℃ for 14 h is used to realize the full dissolution of the high temperature stable phase Al₂CuMg. The proper homogenization processing is heating at 470 ℃ for 40 h and 485 ℃ for 14 h, which is consistent with the results of homogenizing kinetic analysis.

Key words: Al-Zn-Mg-Cu alloy, homogenization, phase transformation, microstructure

中图分类号:

TG146.2

朱鹏程, 姜丽军, 向康宁, 黄杰, 姚丹, 余鑫祥. Al-8.0Zn-2.0Mg-2.1Cu合金均匀化过程中Al₂CuMg相的消除[J]. 金属热处理, 2020, 45(5): 40-44.

Zhu Pengcheng, Jiang Lijun, Xiang Kangning, Huang Jie, Yao Dan, Yu Xinxiang. Elimination of Al₂CuMg phase during homogenization in Al-8.0Zn-2.0Mg-2.1Cu alloy[J]. Heat Treatment of Metals, 2020, 45(5): 40-44.

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Al-8.0Zn-2.0Mg-2.1Cu合金均匀化过程中Al₂CuMg相的消除

Elimination of Al₂CuMg phase during homogenization in Al-8.0Zn-2.0Mg-2.1Cu alloy

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