离心铸造Al-60Si合金的数值模拟与实验研究  

Numerical Simulation and Experimental Study on Al-60Si Alloy by Centrifugal Casting

作　　者：丁琪 卢迪 曹鹏 上官晋飞 刘国怀[3] Ding Qi;Lu Di;Cao Peng;Shangguan Jinfei;Liu Guohuai(Military Delegate Office in Zhuzhou Area,Bureau of Army Air Corps,Armaments Department of the Chinese People’s Liberation Army,Zhuzhou Hunan 412000,China;AECC South Industry Company Limited,Zhuzhou Hunan 412000,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang Liaoning 110819,China)

机构地区：[1]中国人民解放军陆军装备部航空军事代表局驻株洲地区航空军事代表室,湖南株洲412000 [2]中国航发南方工业有限公司,湖南株洲412000 [3]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《硬质合金》2024年第3期179-189,共11页Cemented Carbides

基　　金：国家自然科学基金(52071065);中央高校基本科研业务费(N2007007);国家重点研发计划(2016YFB0301201)。

摘　　要：高硅铝合金由于具有较低的热膨胀系数、低密度、导热性能好等良好的物理化学性能,已成为最具有潜力的金属基电子封装材料。然而,高硅铝合金常规制备方法,如粉末冶金等,制备出的合金存在致密度低、合金内部容易产生气孔、组织粗大等问题,且成本较高。本文以Al-60Si超高硅铝合金作为研究对象,采用ProCast数值模拟的方法,计算了不同浇注温度、离心转速等工艺条件下,合金凝固过程中温度场和流场等分布规律,确定最优工艺参数为离心转速800 r/min,浇注温度1200℃,浇注速度16.5 mm/s;并制备了高性能的细晶Al-60Si合金环形铸件,发现铸环外层、中层和内层分布不同尺寸的初生硅相,外层部分大多数是块状初生硅相;中层及内层部分是粗大的板条状初生硅相;通过表征热膨胀系数发现,离心后的Al-60Si热膨胀系数整体小,其中铸环外层区域热膨胀系数最小,性能较好。High-silicon aluminum alloy has become the most promising metal-based electronic packaging material due to its excellent physical and chemical properties,such as low coefficient of thermal expansion,low density,and good thermal conductivity.However,conventional preparation methods for high-silicon aluminum alloys,such as powder metallurgy,result in low density,the formation of pores,coarse microstructure,and high cost during alloy preparation.This paper took Al-60Si ultra-high-silicon aluminum alloy as the research object and used the ProCast numerical simulation method to calculate the distribution of temperature field and flow field during the solidification process of Al-60Si alloy under different pouring temperatures,centrifugal speeds,and other process conditions.The optimal process parameters were determined to be a centrifugal speed of 800 r/min,a pouring temperature of 1200°C,and a pouring speed of 16.5 mm/s.In addition,high-performance fine-grained Al-60Si alloy cast rings were prepared.It is found that different sizes of primary silicon phases are distributed in the outer,middle,and inner layers of the cast rings,and most of the outer parts are blocklike primary silicon phases.The middle and inner layers are thick lath-like primary silicon phases.By calculating the coefficient of thermal expansion,it is found that the overall coefficient of thermal expansion of Al-60Si after centrifugation is small,and the outer layer of the cast ring has the smallest coefficient of thermal expansion and better performance.

关 键 词：Al-60Si合金 离心铸造 初生硅 温度场 数值模拟 

分 类 号：TG249.4[金属学及工艺—铸造]