Evolution of microstructure and mechanical properties of as-cast Al-50Si alloy due to heat treatment and P modifier content

被引:53
作者
Cao, Fuyang [1 ]
Jia, Yandong [1 ,2 ]
Prashanth, Konda Gokuldoss [2 ]
Ma, Pan [1 ,2 ]
Liu, Jingshun [1 ,3 ]
Scudino, Sergio [2 ]
Huang, Feng [1 ,4 ]
Eckert, Juergen [2 ,5 ]
Sun, Jianfei [1 ]
机构
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[2] Inst Complex Mat, IFW Dresden, D-01171 Dresden, Germany
[3] Inner Mongolia Univ Technol, Sch Mat Sci & Engn, Hohhot 010051, Peoples R China
[4] Wuhan Univ Technol, Sch Automot Engn, Hubei Key Lab Adv Technol Automobile Parts, Wuhan 430070, Peoples R China
[5] Tech Univ Dresden, Inst Werkstoffwissensch, D-01062 Dresden, Germany
基金
中国国家自然科学基金;
关键词
Al-50Si alloy; Superheat treatment; Microstructure; Mechanical property; THERMAL-EXPANSION BEHAVIOR; AL-SI ALLOYS; SUPERHEAT TREATMENT; PRIMARY SILICON; GROWTH; REFINEMENT; PARTICLES; SI-30AL;
D O I
10.1016/j.matdes.2015.03.008
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effects of superheat temperature, content of modifier (P) and T6 heat treatment on the microstructure and mechanical properties of the Al-50Si alloy have been investigated systematically by scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The results indicate that the primary Si exhibits a plate-like morphology, with average size decreasing with increasing of the superheat temperature for the unmodified alloy. The morphology of primary Si changes to small blocky shape at an optimal P content of 0.5 wt.%, and the nucleation temperature increases for the alloy with 1.3 wt.% P because of the ease of formation of the AlP phase. The nucleation temperature is lower for 0.5 wt.% P due to lack of P atoms at relatively higher temperature. The ultimate tensile strength was enhanced by the addition of P followed by the T6 heat treatment, and the maximum ultimate tensile strength (similar to 160 MPa) was observed for the sample containing 0.5 wt.% P. (c) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:150 / 156
页数:7
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