等温热处理过程中半固态AZ91D镁合金的组织演变*

doi:10.11901/1005.3093.2013.795

材料研究学报

2014, Vol. 28

Issue (12): 909-913 DOI: 10.11901/1005.3093.2013.795

本期目录 | 过刊浏览

等温热处理过程中半固态AZ91D镁合金的组织演变*

胡勇¹(

),饶丽¹,胡强²

1. 华东交通大学机电工程学院南昌 330013
2. 江西省科学院江西省铜钨新材料重点实验室南昌 330029

Microstructure Evolution of Semi-Solid AZ91D Alloy During Isothermal Heat Treatment Process

Yong HU^1,^**(

),Li RAO¹,Qiang HU²

1. School of Mechanical and Electromechanical Engineering, East China Jiaotong University, Nanchang 330013
2. Jiangxi Key Laboratory for Advanced Copper and Tungsten Materials, Jiangxi Academy of Sciences, Nanchang 330029

引用本文:

胡勇,饶丽,胡强. 等温热处理过程中半固态AZ91D镁合金的组织演变*[J]. 材料研究学报, 2014, 28(12): 909-913.
Yong HU, Li RAO, Qiang HU. Microstructure Evolution of Semi-Solid AZ91D Alloy During Isothermal Heat Treatment Process[J]. Chinese Journal of Materials Research, 2014, 28(12): 909-913.

全文: PDF(7184 KB) HTML

摘要:

研究等温热处理对半固态AZ91D镁合金组织的影响。结果表明, 随着保温温度的提高和保温时间的延长初生α-Mg相的圆整度提高。在等温热处理过程中, 半固态组织经历了组织分离、球化和粗化长大三个过程。半固态组织中的液相由液池、小液池和液相薄膜3部分组成, 固相由初生α-Mg相和二次凝固时形成的α-Mg相2部分组成。

关键词 ：金属材料, 等温热处理, AZ91D镁合金, 半固态, 显微组织

Abstract：

The effect of isothermal heat treatment on the microstructure evolution of semi-solid AZ91D magnesium alloy was investigated. The results show that the roundness of the primary α-Mg phase increases with the increasing temperature and time. The microstructure evolution of the semi-solid AZ91D experiences three stages during isothermal heat treatment process, i.e. the structure separation, spheroidization and final coarsening. The liquid phase of semi-solid alloy has three types, namely, the molten pool, the “entrapped liquid” pool and the liner liquid film which separates two neighbor particles. The solid phase has two types, namely, the primary α-Mg particles and the α-Mg phase formed in the second solidification.

Key words： metallic materials isothermal heat treatment AZ91D magnesium alloy semi-solid microstructure

收稿日期: 2014-05-23

基金资助:* 江西省青年科学基金20142BAB216015和江西钨铜新材料重点实验室开放基金2013-KLP-07资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2013.795 或 https://www.cjmr.org/CN/Y2014/V28/I12/909

图1 AZ91D镁合金的铸态组织

图2 在不同温度保温15 min的半固态组织

图3 在575℃保温不同时间的半固态组织

图4 在580℃保温不同时间的半固态组织

图5 在575℃保温30 min时AZ91D镁合金的半固态组织

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