功率超声与挤压铸造耦合工艺对Al-5.0Cu合金凝固组织影响的数值模拟与试验研究  

Numerical and Experimental Study on Solidification Microstructure of Al-5.0Cu Alloy under Combined Fields of Power Ultrasonic and Squeeze Casting

作　　者：林波[1] 范滔 张杨[2] 赵愈亮 张卫文[2] 王莹 LIN Bo;FAN Tao;ZHANG Yang;ZHAO Yuliang;ZHANG Weiwen;WANG Ying(School of Mechanical Engineering,Guizhou University,Guiyang 550025;School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640;School of Mechanical Engineering,Dongguan University of Technology,Dongguan 523808)

机构地区：[1]贵州大学机械工程学院,贵阳550025 [2]华南理工大学机械与汽车工程学院,广州510640 [3]东莞理工学院机械工程学院,东莞523808

出　　处：《机械工程学报》2022年第10期87-94,共8页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51704084,52074131);贵州省自然科学基金(黔科合基础-ZK[2021]一般267、黔科合基础2019(1069));贵州省科技成果应用及产业化(黔科合成果[2021]一般067);贵州大学培育(黔科合平台人才[2017]5788-42、贵大培育(2019)23号)资助项目。

摘　　要：采用挤压铸造和功率超声耦合的方式处理Al-5.0Cu合金熔体,利用光学显微镜观察不同工艺参数下的Al-5.0Cu合金的微观组织。使用反分析法计算出耦合作用下铸件-模具的界面换热系数曲线,在此基础上结合CAFE宏-微观耦合模型模拟出不同工艺下Al-5.0Cu合金的凝固组织,并与宏观腐蚀结果进行对比,试验同时测量了熔体内部不同位置的温度变化。通过数值模拟和试验验证相结合的方式,对比研究了不同工艺对Al-5.0Cu合金凝固组织的影响。模拟和试验结果均表明,功率超声和挤压铸造的耦合作用较于单一外场作用能进一步改善合金的凝固组织,同时可以完全消除铸造缺陷;耦合作用还可以使得熔体内部温度分布更加均匀,显著细化Al-5.0Cu合金的初生晶粒,有利于得到均匀、细小微观组织。该结果为细化Al-5.0Cu合金的组织,提高合金的力学性能提供了新的思路。The Al-5.0Cu alloy melt is processed by combined fields of squeeze casting and ultrasonic vibration,and the microstructure under different process parameters are examined by OM.The interfacial heat transfer coefficient curve between cast and mold under combined fields is calculated using inverse analysis,then the solidification microstructures under different conditions are simulated based on CAFE model and compared with the macrostructure,the temperature change during the experiment in the melt is also measured.The effects of different processes on the solidification structure of Al-5.0Cu alloy were studied by means of numerical simulation and experimental verification.The results show that combined fields can further improve the solidification structure of the alloy and completely eliminate the casting defects compared with the single external field.The combined fields can also lead to the uniformly distribution of temperature in the melt and significant refinement of Al-5.0Cu alloy primary grain,which is beneficial to obtain uniform and fine microstructure.The results provide a new idea for refining the microstructure and improving the mechanical properties of Al-5.0Cu alloy.

关 键 词：Al-5.0Cu合金 超声振动 挤压压力 数值模拟 CAFE模型 

分 类 号：TG24[金属学及工艺—铸造]