Evolution of Microstructure and Mechanical Properties of the Thixo-diecast 319s Alloy during Heat Treatment

被引：2

作者：

Li, Daquan ^{[1
]}

Liang, Xiaokang ^{[1
]}

Yang, Fubao ^{[1
]}

He, Youfeng ^{[1
]}

Zhang, Fan ^{[1
]}

Zhu, Qiang ^{[1
]}

Zhang, Shaoming ^{[1
]}

机构：

[1] Gen Res Inst Nonferrous Met, Beijing 100088, Peoples R China

来源：

LIGHT METALS TECHNOLOGY 2013 | 2013年 / 765卷

关键词：

Heat treatment; Alloy; 319s; Thixo-diecast; CASTING ALLOYS; MG; REFINEMENT;

D O I：

10.4028/www.scientific.net/MSF.765.511

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The evolution of microstructure and mechanical properties during solution and ageing heat treatment process was studied in terms of a thixo-diecast impeller of 319s aluminium alloy. The cast alloy exhibited a microstructure consisting of primary uniformly distributed in alpha-Al globules and the eutectics. A series of heat treatment studies were performed to determine optimum heat treatment parameters, in order to achieve fine grain structure, fine silicon particles and optimal precipitate size and distribution. Optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed to study the evolution of microstructure and mechanical properties. The results demonstrate that, the full T6 heat treatments are successfully applied to thixo-diecast 319s impellers. A two-step solution heat treatment is employed to prevent porosity due to overheating. The tensile properties of thixo-diecast 319s impellers were substantially enhanced after T6 heat treatment. The plate-shaped theta' precipitates and lath-shaped Q' precipitates are the most effective for precipitation strengthening.

引用

页码：511 / 515

页数：5

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