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Study on Microstructure and Mechanical Properties of Hypereutectic Al-18Si Alloy Modified with Al-3B
Chunjie Gong1,2,3, Hao Tu4,5,6, Changjun Wu7,8,9
1Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China. gongchunjie2000@foxmail.com.
Abstract:
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 °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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