(1. 清華大學(xué)機(jī)械工程系， 北京100084；
2. 北京科技大學(xué)鑄造研究所， 北京100083)
摘 要: 論述了AlSi7Mg合金坯料結(jié)構(gòu)演化過(guò)程中的固相顆粒尺寸及分布、顆粒形貌、 顆粒團(tuán)聚化程度等影響因素， 研究了在半固態(tài)狀態(tài)下合金的結(jié)構(gòu)演化對(duì)AlSi7Mg合金變形行為的影響。結(jié)果表明， 在半固態(tài)狀態(tài)下，亞共晶AlSi7Mg合金坯料的觸變變形行為密切依賴于固相的結(jié)構(gòu)和試樣在壓縮變形前的固相結(jié)構(gòu)演化。初始非枝晶結(jié)構(gòu)或枝晶演化成球狀化結(jié)構(gòu)能在很低的應(yīng)力下變形。 在完全球狀化條件下， 固相顆粒尺寸對(duì)應(yīng)力水平?jīng)]有明顯影響。
關(guān)鍵字: AlSi7Mg合金坯料； 結(jié)構(gòu)演化； 半固態(tài)區(qū)間；觸變變形
（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
