Al-Cu-Mg-Mn-Sc-Zr合金均匀化过程中的结构转变

doi:10.13251/j.issn.0254-6051.2020.04.011

金属热处理 ›› 2020, Vol. 45 ›› Issue (4): 55-59.DOI: 10.13251/j.issn.0254-6051.2020.04.011

Al-Cu-Mg-Mn-Sc-Zr合金均匀化过程中的结构转变

廖思敏, 苏玉长, 海丰龙

中南大学材料科学与工程学院, 湖南长沙 410004

收稿日期:2020-01-04 出版日期:2020-04-25 发布日期:2020-05-08
通讯作者: 苏玉长,教授,博士,E-mail:ychsu@csu.edu.cn
作者简介:廖思敏(1995—),男,硕士研究生,主要从事轻合金方面研究,E-mail:lsm9502@sina.com

Microstructural evolution of Al-Cu-Mg-Mn-Sc-Zr alloy during homogenization

Liao Simin, Su Yuchang, Hai Fenglong

School of Materials Science and Engineering, Central South University, Changsha Hunan 410004, China

Received:2020-01-04 Online:2020-04-25 Published:2020-05-08

摘要/Abstract

摘要： 通过电子探针微分析(EPMA)等手段研究了Al-Cu-Mg-Mn-Sc-Zr合金均匀化过程中的结构演变。结果显示:铸态时,晶界上存在大量共晶网络状Al₂Cu相及Al₆(Mn,Cu)相,初生Al₃(Sc,Zr)和Al₂CuMg相形成较少, 并没有发现W(AlCuSc)相。在520 ℃下均匀化,Al₂Cu相在12 h后就几乎完全回溶,16 h彻底溶解,这与均匀化动力学分析得到的14.1 h基本吻合,而Al₆(Mn,Cu)相并不能溶解,且在均匀化过程中会形成一些粗大的、不连续排列的W相颗粒,可见添加Sc会影响均匀化过程中的组织变化。

关键词: Sc, Zr, 均匀化, W相, 动力学

Abstract: The microstructure evolution of Al-Cu-Mg-Mn-Sc-Zr alloy was investigated by electron probe microanalysis (EPMA). The results show that there are a large number of the eutectic network-like Al₂Cu phase and Al₆(Mn,Cu) phase in the grain boundary, and there is less formation of the primary Al₃(Sc,Zr) and Al₂CuMg phases. The W (AlCuSc) phase in the alloy can not be detected. Al₂Cu almost all dissolves into the Al matrix after homogenizing at 520 ℃ for 12 h and dissolves completely after 16 h, which is basically consistent with the kinetics analysis result of the homogenization process for 14.1 h. However, the Al₆(Mn,Cu) phase can not dissolve. Furthermore, some coarse and discontinuous arranged W phase particles can form during the homogenization process. So the microstructural evolution during the homogenization is affected by the Sc addition.

Key words: Sc, Zr, homogenization, W phase, kinetics

中图分类号:

TG146.2

廖思敏, 苏玉长, 海丰龙. Al-Cu-Mg-Mn-Sc-Zr合金均匀化过程中的结构转变[J]. 金属热处理, 2020, 45(4): 55-59.

Liao Simin, Su Yuchang, Hai Fenglong. Microstructural evolution of Al-Cu-Mg-Mn-Sc-Zr alloy during homogenization[J]. Heat Treatment of Metals, 2020, 45(4): 55-59.

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Al-Cu-Mg-Mn-Sc-Zr合金均匀化过程中的结构转变

Microstructural evolution of Al-Cu-Mg-Mn-Sc-Zr alloy during homogenization

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