等温热处理对Mg-Gd-Zn-Zr合金半固态组织的影响

doi:10.13251/j.issn.0254-6051.2020.02.033

金属热处理 ›› 2020, Vol. 45 ›› Issue (2): 175-180.DOI: 10.13251/j.issn.0254-6051.2020.02.033

等温热处理对Mg-Gd-Zn-Zr合金半固态组织的影响

尹健¹, 卢春辉², 谢世坤¹, 易荣喜¹, 黄文先³

1. 井冈山大学机电工程学院, 江西吉安 343009;
2. 南昌航空大学航空制造工程学院, 江西南昌 330063;
3. 井冈山大学建筑工程学院, 江西吉安 343009

收稿日期:2019-08-20 出版日期:2020-02-25 发布日期:2020-04-03
通讯作者: 谢世坤(1973—),男,教授,博士,主要从事轻合金材料研究,联系电话:0796-8110900,E-mail:xskun@163.com
作者简介:尹健(1980—),男,副教授,博士,主要从事高性能镁合金开发,联系电话:0796-8106067,E-mail:yinjiandonic@yahoo.com。
基金资助:
国家自然科学基金(51661023);江西省自然科学基金(20181BAB206028);江西省教育厅科学技术研究项目(GJJ160732,GJJ160733)

Effect of isothermal heat treatment on semi-solid microstructure of Mg-Gd-Zn-Zr alloy

Yin Jian¹, Lu Chunhui², Xie Shikun¹, Yi Rongxi¹, Huang Wenxian³

1. School of Mechanical and Electrical Engineering, Jinggangshan University, Ji'an Jiangxi 343009, China;
2. School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang Jiangxi 330063, China;
3. School of Building Engineering, Jinggangshan University, Ji'an Jiangxi 343009, China

Received:2019-08-20 Online:2020-02-25 Published:2020-04-03

摘要/Abstract

摘要：

选择稍高于共晶反应温度作为等温热处理温度,对铸态Mg-15Gd-2Zn-0.6Zr合金进行等温热处理,获得了半固态球化组织。研究了热处理温度和保温时间对半固态组织的影响,探讨了半固态组织演变机制及适用于低温等温热处理的半固态Mg-Gd-Zn-Zr合金成分设计。结果表明,液相组织具有低的温度敏感性,其组织演变主要机制为α-Mg表面熔化和α-Mg动态再析出,而固相颗粒球化机制为:α-Mg树枝晶→枝晶臂粗化→枝晶臂合并、不规则多边形化→球化。

关键词: Mg-Gd-Zn-Zr合金, 半固态, 等温热处理, 组织演变

Abstract:

Semi-solid spheroidized microstructure was obtained by isothermal treatment on as-cast Mg-15Gd-2Zn-0.6Zr alloy at the temperature slightly higher than eutectic temperature. The effects of isothermal heat treatment temperature and holding time on semi-solid microstructure were studied, and the mechanism of semi-solid microstructure evolution and the composition design of semi-solid Mg-Gd-Zn-Zr alloy were discussed. The results show that the volume fraction of liquid phase has a low sensitivity to temperature. The mechanism of the liquid phase evolution is α-Mg surface melting and α-Mg dynamic precipitation. And the spheroidization mechanism of solid phase particles is as follows: α-Mg dendritic→dendritic arm coarsening→dendritic arm merging and irregular polygonization→spheroidization.

Key words: Mg-Gd-Zn-Zr alloy, semi-solid, isothermal heat treatment, microstructure evolution

中图分类号:

TG166.4

尹健, 卢春辉, 谢世坤, 易荣喜, 黄文先. 等温热处理对Mg-Gd-Zn-Zr合金半固态组织的影响[J]. 金属热处理, 2020, 45(2): 175-180.

Yin Jian, Lu Chunhui, Xie Shikun, Yi Rongxi, Huang Wenxian. Effect of isothermal heat treatment on semi-solid microstructure of Mg-Gd-Zn-Zr alloy[J]. HTM, 2020, 45(2): 175-180.

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等温热处理对Mg-Gd-Zn-Zr合金半固态组织的影响

Effect of isothermal heat treatment on semi-solid microstructure of Mg-Gd-Zn-Zr alloy

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