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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 10    October 2019

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Effect of complex modification of Al-5Ti and Al-3P on hypereutectic Al-18Si alloys
WANG Jian-hua(王建华)1, 2, 3, YANG Wei(杨威)1, 2, 3, TU Hao(涂浩)1, 2, 3, LIU Ya(刘亚)1, 2, 3,PENG Hao-ping(彭浩平)1, 2, 3, SU Xu-ping(苏旭平)1, 2, 3

1. Jiangsu Key Laboratory of Materials Surface Science and Technology, School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China;
2. Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou 213164, China;
3. National Experimental Teaching Demonstration Center of Materials Science and Engineering,Changzhou University, Changzhou 213164, China

Abstract:The solidification microstructure, fracture morphologies, and mechanical properties of an Al-18Si alloy and alloys modified with Al-5Ti and Al-3P master alloys were investigated using an optical microscope, scanning electron microscope, and an electronic universal testing machine. The results show that additions of Al-5Ti and Al-3P have significant effects on the size and area fraction of the primary Si and the mechanical properties of the Al-18Si alloy. Compared to the Al-18Si alloy modified with 0.6 wt% Al-5Ti at 850 °C, when the Al-18Si alloy was modified with 0.3 wt% Al-5Ti and 0.5 wt% Al-3P at the same temperature, the average size of the primary Si decreased from 39 to 14 μm and the area fraction increased from 9.5% to 11.6%. The biggest influencing factor on the tensile strength and elongation of the Al-18Si alloy is the addition of Al-3P, followed by the modification temperature and the addition of Al-5Ti. At a modification temperature of 850 °C, the tensile strength and elongation of the Al-18Si alloy modified with 0.3 wt% Al-5Ti+0.5 wt% Al-3P increased by 19.6% and 88.6%, respectively compared to that of the Al-18Si alloy modified with 0.6 wt% Al-5Ti.

 

Key words: hypereutectic Al-Si alloy; modification; solidification structure; mechanical properties

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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