半固态高硅铝合金的热力学模拟  

Thermodynamic simulation of high silicon aluminum alloys for semi-solid processing

作　　者：方亮[1] 陈志国[1,2] 白月龙[3,4] 张洪博[1] 张海筹[2] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]湖南人文科技学院机电工程系,娄底417000 [3]北京有色金属研究总院,北京100088 [4]湖南文昌科技有限公司,娄底417000

出　　处：《中国有色金属学报》2016年第4期715-722,共8页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51011120052);国际科技合作资助项目(2015DFA51230)~~

摘　　要：采用基于CALPHAD法的热力学模拟对Al-x Si-y Cu-z Mg半固态高硅铝合金进行合金成分的优化设计。实验以元素Si、Cu、Mg为因变量,对Al-Si-Cu-Mg四元高硅铝合金进行热力学模拟,并用DSC测试分析验证模拟结果,对合金成分进行了优化。结果表明:Cu、Mg是合金设计的两个关键元素,能显著影响液相体积分数对温度的敏感度以及温度间隔,而Si元素对其影响较小。结合半固态合金热力学设计判据,Al-17Si-4.5Cu-1.5Mg、Al-17Si-5Cu-1Mg和Al-17Si-4Cu-2Mg是较理想的半固态触变成形用高硅铝合金。The thermodynamic simulation based on CALPHAD method was applied to optimize the high silicon aluminum alloys Al-x Si-y Cu-z Mg for semi-solid thixoforming. This simulation was performed with three parameters Si, Cu and Mg, and the results were analyzed and compared with the DSC test, and then, the semi-solid alloys were optimized. The results show that Cu and Mg are two key elements for alloys design and can notably affect liquid volume fraction vs temperature sensitivity and temperature interval, while Si has little effect on these two parameters. Considering the criterion of alloys design, some new optimal alloys for semi-solid processing are available: Al-17Si-4.5Cu-1.5Mg, Al-17Si-5Cu-1Mg and Al-17Si-4Cu-2Mg.

关 键 词：高硅铝合金 CALPHAD方法 半固态触变成形 

分 类 号：TG146.21[一般工业技术—材料科学与工程]