硅相形态及含量对Al-Si合金线膨胀系数的影响  

Influence of morphology and content of silicon phase on CTE of Al-Si alloys

作　　者：武玉英[1] 刘相法[1] 戴勇[2] 姜炳刚[3] 边秀房[1] 

机构地区：[1]山东大学材料液态结构及其遗传性教育部重点实验室,济南250061 [2]济钢集团山东冶金设备制造公司,济南250101 [3]山东大学材料科学与工程学院,济南250061

出　　处：《中国有色金属学报》2007年第5期688-692,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50171037);山东省自然科学基金资助项目(Z2004F03)

摘　　要：利用金相显微镜、DIL402C高温膨胀仪等对Al-Si合金的线膨胀进行了研究。结果表明:对于Al-Si合金,硅含量越高,其线膨胀系数越小,随温度变化幅度减小;随着温度升高,磷变质比锶变质的线膨胀系数变化幅度小,合金更加稳定;此外,T6热处理也显著降低Al-Si合金的线膨胀系数。通过对合金线膨胀系数和微观组织的对比观察发现:硅相的形态和体积分数对Al-Si合金的线膨胀系数产生重要影响。初晶硅体积分数的增加和初晶硅的析出能够显著降低Al-Si合金的线膨胀系数,共晶硅的形态对合金线膨胀系数也有一定的影响,共晶硅为短棒状、颗粒状时(尤其经热处理后),合金的线膨胀系数也显著降低。The linear coefficient of thermal expansion （CTE） of Al-Si alloys was studied by using Hi-scope video microscope and DIL 402C high temperature dilatometer. The results reveal that the CTE of Al-Si alloys decreases with increasing Si level. Compared with Sr modification, the Al-Si alloy modified with P has a lower CTE and is more stabilized. Moreover, T6 heat treatment can also decrease the CTE of Al-Si alloys, and improve the stability during heating-up. According to the contrasts above and combined with microstructure observation, it is found that Si phase has important influence on CTE of Al-Si alloys. The increase of volume fraction and precipitation of primary Si both can decrease the CTE. Also, eutectic Si exerts certain influence on the CTE of Al-Si alloys, i.e. the CTE decreases when eutectic Si exhibits morphology of short-bar shape and small particles, especially aider heat treatment.

关 键 词：AL-SI合金 线膨胀系数 热处理 变质处理 

分 类 号：TG146.2[一般工业技术—材料科学与工程]