Journal of Central South University

, Volume 26, Issue 10, pp 2651–2660 | Cite as

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

  • Jian-hua Wang (王建华)
  • Wei Yang (杨威)
  • Hao Tu (涂浩)
  • Ya Liu (刘亚)
  • Hao-ping Peng (彭浩平)
  • Xu-ping Su (苏旭平)Email author


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 

Al-5Ti 和Al-3P 对过共晶Al-18Si 合金的复合变质效果


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 °C 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39 μm 减小到14 μm,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%。w


过共晶铝硅合金 变质处理 凝固组织 力学性能 


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Copyright information

© Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Jiangsu Key Laboratory of Materials Surface Science and Technology, School of Materials Science and EngineeringChangzhou UniversityChangzhouChina
  2. 2.Jiangsu Collaborative Innovation Center of Photovoltaic Science and EngineeringChangzhou UniversityChangzhouChina
  3. 3.National Experimental Teaching Demonstration Center of Materials Science and EngineeringChangzhou UniversityChangzhouChina

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