Microstructure evolution and thixoforming behavior of 7075 aluminum alloy in the semi-solid state prepared by RAP method

被引：23

作者：

Fu, Jin-long ^{[1
]}

Wang, Kai-kun ^{[1
]}

Li, Xiao-wei ^{[1
]}

Zhang, Hai-kuan ^{[2
]}

机构：

[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

[2] Tianjin Zhonglian Precis Casting Co Ltd, Tianjin 301800, Peoples R China

来源：

INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS | 2016年 / 23卷 / 12期

基金：

中国国家自然科学基金;

关键词：

aluminum alloys; microstructural evolution; thixoforming grain coarsening; segregation; LIQUID SEGREGATION PHENOMENA; SIMA PROCESS; MECHANICAL-PROPERTIES; THIXOTROPIC MICROSTRUCTURE; TENSILE PROPERTIES; MAGNESIUM ALLOY; SOLID FRACTION; ROUTE; CAST;

D O I：

10.1007/s12613-016-1364-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effects of isothermal treatments on the microstructural evolution and coarsening rate of semi-solid 7075 aluminum alloy produced via the recrystallization and partial remelting (RAP) process were investigated. Samples of 7075 aluminum alloy were subjected to cold extrusion, and semi-solid treatment was carried out for 5-30 min at temperatures ranging from 580 to 605A degrees C. A backward-extrusion experiment was conducted to investigate liquid segregation during the thixoforming process. The results revealed that obvious grain coarsening and spheroidization occurred during prolonged isothermal treatments. In addition, higher soaking temperatures promoted the spheroidization and coarsening process because of the increased liquid fraction and the melting of second phases. Segregation of the liquid phase caused by the difference in fluidity between the liquid and the solid phases was observed in different regions of the thixoformed specimens.

引用

页码：1404 / 1415

页数：12

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