(1. 華東理工大學(xué) 承壓系統(tǒng)與安全教育部重點(diǎn)實(shí)驗(yàn)室，上海 200237；
2. 沈陽(yáng)國(guó)際工程咨詢中心，沈陽(yáng) 110014；
3. 華東理工大學(xué) 資源與環(huán)境工程學(xué)院，上海 200237)
摘 要: 對(duì)采用近液相線鑄造法制備的6061鋁合金半固態(tài)坯料進(jìn)行熱模擬壓縮試驗(yàn)，根據(jù)試驗(yàn)獲得的6061鋁合金不同溫度與應(yīng)變速率下的應(yīng)力-應(yīng)變曲線，采用多元回歸線性方法建立能夠表征6061鋁合金半固態(tài)變形行為的本構(gòu)方程。根據(jù)Stefan等研究學(xué)者提出的半固態(tài)漿料的表觀黏度與熱模擬壓縮試驗(yàn)中的應(yīng)變速率等參數(shù)間的關(guān)系式，對(duì)表觀黏度和剪切速率之間的關(guān)系進(jìn)行了研究。應(yīng)用仿真軟件ANYCASTING模擬充填速度對(duì)6061鋁合金半固態(tài)觸變壓鑄過程的影響。結(jié)果表明：Bingham模型中表觀黏度等各個(gè)參數(shù)的確定符合實(shí)際生產(chǎn)經(jīng)驗(yàn)值，為6061鋁半固態(tài)合金零件觸變壓鑄過程的研究提供了一定的理論基礎(chǔ)。
關(guān)鍵字: 半固態(tài)6061鋁合金；本構(gòu)方程；表觀黏度；剪切速率；數(shù)值模擬
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
