(1. 清华大学机械工程系， 北京100084；
2. 北京科技大学铸造研究所， 北京100083)
摘 要: 论述了AlSi7Mg合金坯料结构演化过程中的固相颗粒尺寸及分布、颗粒形貌、 颗粒团聚化程度等影响因素， 研究了在半固态状态下合金的结构演化对AlSi7Mg合金变形行为的影响。结果表明， 在半固态状态下，亚共晶AlSi7Mg合金坯料的触变变形行为密切依赖于固相的结构和试样在压缩变形前的固相结构演化。初始非枝晶结构或枝晶演化成球状化结构能在很低的应力下变形。 在完全球状化条件下， 固相颗粒尺寸对应力水平没有明显影响。
关键字: AlSi7Mg合金坯料； 结构演化； 半固态区间；触变变形
（1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R.China；
2. Institute of Casting, University of Science and Technology Beijing, Beijing100083, P.R.China）
Abstract:The microstructure evolution of AlSi7Mg alloy slurry in the semisolid zone has an important effect on AlSi7Mg alloy slurry viscosity, and is a main influencing factor of the inherent constitutive thixotropic behavior. The influencing factors, such as the degree of agglomeration among solid particles, particle size, particle morphology, and distribution of particle sizes, in AlSi7Mg alloy slurry microstructure evolution were described. The effect of AlSi7Mg alloy slurry microstructure evolution in the semisolid zone on AlSi7Mg alloy compression deformation was explored.
Key words: AlSi7Mg alloy slurries; initial microstructure evolution; semisolid zone; thixotropy deformation
