| 等温热处理对Mg-Gd-Zn-Zr合金半固态组织的影响 |
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| 引用本文： | 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. |
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| 作者姓名： | 尹健 卢春辉 谢世坤 易荣喜 黄文先 |
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| 作者单位： | 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 |
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| 基金项目： | 江西省自然科学基金;江西省教育厅科学技术研究项目;国家自然科学基金 |
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| 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。
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| 关 键 词： | Mg-Gd-Zn-Zr合金 半固态 等温热处理 组织演变 |
| 收稿时间： | 2019-08-20 |
Effect of isothermal heat treatment on semi-solid microstructure of Mg-Gd-Zn-Zr alloy |
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| 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].Heat Treatment of Metals,2020,45(2):175-180. |
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| Authors: | Yin Jian Lu Chunhui Xie Shikun Yi Rongxi Huang Wenxian |
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| Affiliation: | 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 |
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| Abstract: | Semi-solid spheroidized microstructure was obtained by isothermal treatment on as-cast Mg-15 Gd-2 Zn-0. 6 Zr 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. |
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| Keywords: | Mg-Gd-Zn-Zr alloy semi-solid isothermal heat treatment microstructure evolution |
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