Effect of complex modification of Al-5Ti and Al-3P on hypereutectic Al-18Si alloys  

Al-5Ti和Al-3P对过共晶Al-18Si合金的复合变质效果（英文）

作　　者：WANG Jian-hua YANG Wei TU Hao LIU Ya PENG Hao-ping SU Xu-ping 王建华;杨威;涂浩;刘亚;彭浩平;苏旭平(Jiangsu Key Laboratory of Materials Surface Science and Technology,School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China;Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering,Changzhou University,Changzhou 213164,China;National Experimental Teaching Demonstration Center of Materials Science and Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[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

出　　处：《Journal of Central South University》2019年第10期2651-2660,共10页中南大学学报（英文版）

基　　金：Project(51571039) supported by the National Natural Science Foundation of China

摘　　要：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 14μm 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.本文采用光学显微镜、扫描电子显微镜和电子万能试验机等仪器,研究了Al-5Ti和Al-3P变质Al-18Si合金的凝固组织、断口形貌和力学性能。结果表明,与0.6%Al-5Ti变质Al-18Si合金相比,在850℃温度下采用0.3wt%Al-5Ti和0.5wt%Al-3P对Al-18Si合金进行复合变质处理,使合金中初晶硅平均尺寸从39μm减小到14μm,其面积分数从9.5%增加到11.6%。对合金抗拉强度和延伸率影响最大的因素是Al-3P,其次是变质温度和Al-5Ti。0.3wt%Al-5Ti和0.5wt%Al-3P变质Al-18Si合金的抗拉强度和延伸率分别比0.6%Al-5Ti变质Al-18Si合金的提高19.6%和88.6%。

关 键 词：hypereutectic Al-Si alloy MODIFICATION solidification structure mechanical properties 

分 类 号：TG1[金属学及工艺—金属学]