(1. 华东理工大学 承压系统与安全教育部重点实验室，上海 200237；
2. 沈阳国际工程咨询中心，沈阳 110014；
3. 华东理工大学 资源与环境工程学院，上海 200237)
摘 要: 对采用近液相线铸造法制备的6061铝合金半固态坯料进行热模拟压缩试验，根据试验获得的6061铝合金不同温度与应变速率下的应力-应变曲线，采用多元回归线性方法建立能够表征6061铝合金半固态变形行为的本构方程。根据Stefan等研究学者提出的半固态浆料的表观黏度与热模拟压缩试验中的应变速率等参数间的关系式，对表观黏度和剪切速率之间的关系进行了研究。应用仿真软件ANYCASTING模拟充填速度对6061铝合金半固态触变压铸过程的影响。结果表明：Bingham模型中表观黏度等各个参数的确定符合实际生产经验值，为6061铝半固态合金零件触变压铸过程的研究提供了一定的理论基础。
关键字: 半固态6061铝合金；本构方程；表观黏度；剪切速率；数值模拟
automobile aluminum alloy part
（1. Key Laboratory of Pressure Systems and Safety, Ministry of Education,
East China University of Science and Technology, Shanghai 200237, China;
2. Shenyang International Engineering Consulting Center, Shenyang 110014, China;
3. School of Resource and Environmental Engineering, East China University of Science and Technology,
Shanghai 200237, China）
Abstract:The thermal simulation compression tests on semi-solid billet of 6061 aluminum alloy prepared by near-liquids semi-continuous casting method were carried out. According to the experiment results of the stress-strain curves at different temperatures and strain rates, the constitutive equation of semi-solid 6061 aluminum alloy was established through multiple regressions. The relationship between apparent viscosity and the shear rate was investigated based on the equations about semi-solid slurry viscosity and shear rate in the thermal simulation compression tests presented by Stefan. The software ANYCASTING was applied to simulate and analyze the effects of the filling speed on the semi-solid die-casting process of 6061 aluminum alloy. The results show that, the parameters determination of Bingham model, such as apparent viscosity, is adjusted empirically during the simulation study, which provides a technological reference for the study of semi-solid die-casting simulation of 6061 aluminum alloy parts.
Key words: semi-solid 6061 aluminum alloy; constitutive equation; apparent viscosity; shear rate; numerical simulation
