摘要
To optimize the solution treatment process of a modified high-pressure die-cast AlSi10MnMg alloy, the influence of the solution treatment on the microstructure, mechanical properties and fracture mechanisms was studied using OM, SEM, EBSD and tensile test. The experimental results suggest that the solution treatment could be completed in a shorter time at a temperature much lower than the conventional practice. Surface blistering could be avoided and substantial strengthening effect could be achieved in the following aging process. Prolonging solution treatment time and elevating solution temperature would be meaningless or even harmful. The rapid evolution of eutectic silicon during solution treatment, especially at the early stage, affected the way of interaction among α-Al grains during plastic deformation, and changed the ultimate mechanical properties and fracture mode.
为了优化变质AlSi10MnMg压铸合金的固溶工艺,采用OM、SEM、EBSD和拉伸试验研究固溶处理对合金组织、力学性能和断裂机制的影响。结果显示,固溶处理可在比传统工艺更低温度、更短时间的条件下完成,能避免表面鼓泡,并在随后的时效过程中获得较好的强化效果。延长固溶时间、提高固溶温度不能提高时效后合金的强度,甚至会对其产生不利影响。固溶过程中(尤其是早期)共晶硅形态的快速演化影响α-Al晶粒间的相互作用,进而改变最终的力学性能和断裂模式。
基金
Project(U1537202) supported by the National Natural Science Foundation of China
Project(BA2015041) supported by the Special Funding Program on Transformation of Scientific and Technological Achievements in Jiangsu Province,China
作者简介
Corresponding author:Shou-mei XIONG;Tel:86-10-62773793;Fax:86-10-62770190;E-mail:smxiong@tsinghua.edu.cn.
