Effect of hot extrusion and subsequent T6 treatment on the microstructure evolution and tensile properties of an Al-6Si-2Cu-0.5Mg alloy

被引：24
|
作者：
Xu, Cong [1 ]
Zheng, Ruixiao [1 ]
Hanada, Shuji [2 ]
Xiao, Wenlong [1 ]
Ma, Chaoli [1 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Aerosp Adv Mat & Performance, Beijing 100191, Peoples R China
[2] Tohoku Univ, Inst Mat Res, Sendai 9808577, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 710卷
基金：
中国国家自然科学基金;
关键词：
Al-6Si-2Cu-0.5Mg alloy; Extrusion temperature; Microstructure; Strength; Ductility; MECHANICAL-PROPERTIES; HEAT-TREATMENT; COOLING RATE; MG; CU; PARTICLES; BEHAVIOR; ELEMENTS; COPPER; PHASE;
D O I：
10.1016/j.msea.2017.10.052
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this work, an Al-6Si-2Cu-0.5Mg alloy was subjected to hot extrusion at various temperatures (400 degrees C, 450 degrees C and 500 degrees C) followed by subsequent T6 heat treatment, and the effect of aforementioned thermal-mechanical treatment on the microstructure evolution and tensile properties was systematically investigated. Microstructure observed suggested that both eutectic Si particles and primary intermetallic particles (Q phase) were refined by hot extrusion. Further T6 treatment led to the dissolution of the Q phase and the formation of nano-precipitates. Tensile test revealed that the alloy extruded at 450 degrees C (after T6 treatment) exhibited the best combination of strength and ductility. Increasing or decreasing the extrusion temperature resulted in the deterioration of ductility. The effect of the extrusion temperature and T6 treatment on the mechanical properties was discussed based on the microstructure evolution.
引用
收藏
页码：102 / 110
页数：9
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