Study on Microstructure and Mechanical Properties of Hypereutectic Al-18Si Alloy Modified with Al-3B

被引：21
作者：
Gong, Chunjie [1 ,2 ,3 ]
Tu, Hao [1 ,2 ,3 ]
Wu, Changjun [1 ,2 ,3 ]
Wang, Jianhua [1 ,2 ,3 ]
Su, Xuping [1 ,2 ,3 ]
机构：
[1] Changzhou Univ, Jiangsu Key Lab Mat Surface Sci & Technol, Changzhou 213164, Peoples R China
[2] Changzhou Univ, Jiangsu Collaborat Innovat Ctr Photovolta Sci & E, Changzhou 213164, Peoples R China
[3] Changzhou Univ, Natl Expt Teaching Demonstrat Ctr Mat Sci & Engn, Changzhou 213164, Peoples R China
来源：
MATERIALS | 2018年 / 11卷 / 03期
基金：
中国国家自然科学基金;
关键词：
hypereutectic Al-18Si alloy; modification; microstructure; mechanical properties; AL-SI ALLOY; MASTER ALLOY;
D O I：
10.3390/ma11030456
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
An hypereutectic Al-18Si alloy was modified via an Al-3B master alloy. The effect of the added Al-3B and the modification temperature on the microstructure, tensile fracture morphologies, and mechanical properties of the alloy were investigated using an optical microscope, Image-Pro Plus 6.0, a scanning electron microscope, and a universal testing machine. The results show that the size of the primary Si and its fraction decreased at first, and then increased as an additional amount of Al-3B was added. When the added Al-3B reached 0.2 wt %, the fraction of the primary Si in the Al-18Si alloy decreased with an increase in temperature. Compared with the unmodified Al-18Si alloy, the tensile strength and elongation of the alloy modified at 850 degrees C with 0.2 wt % Al-3B increased by 25% and 81%, respectively. The tensile fracture of the modified Al-18Si alloy exhibited partial ductile fracture characteristics, but there were more areas with ductile characteristics compared with that of the unmodified Al-18Si alloy.
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页数：10
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