Zn15Al钎料半固态高速剪切流变模型  

High-speed shearing rheological model of semi-solid Zn15Al solder

作　　者：李清宁 杨梅 黄尚宇[1] 邓凌波 李雨连 冯珂 LI Qing-ning;YANG Mei;HUANG Shang-yu;DENG Ling-bo;LI Yu-lian;FENG Ke(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《塑性工程学报》2022年第3期182-188,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51475345)。

摘　　要：针对磁脉冲辅助半固态钎焊新工艺的高速流变工况,根据高压毛细管流变仪原理设计了一套特定的测试装置,研究了Zn15Al钎料在不同剪切速率和固相率下的流变行为,建立了表观黏度与剪切速率的关系。结果表明,剪切速率越大,Zn15Al钎料中的固相颗粒越细,球化程度越高;钎料具有明显的剪切变稀特征,表观黏度与剪切速率呈幂指数关系;固相率越高,表观黏度随剪切速率的增加下降得越快。基于LS-DYNA平台,将建立的流变模型用于磁脉冲辅助半固态钎焊过程的模拟分析,并通过钎焊实验验证了模型的有效性。Aiming at high-speed rheological working condition of magnetic pulse-assisted semi-solid brazing,a specific test device was designed according to the principle of high pressure capillary rheometer.The rheological behavior of Zn15 Al solder with different shear rates and solid fractions was studied,and the relationship between apparent viscosity and shear rate was established.The results show that the larger the shear rate is,the finer the solid particles in Zn15 Al solder are and the higher the spheroidization degree is.The solder presents obvious shear thinning characteristic and the apparent viscosity has an exponential relationship with shear rate.The higher the solid fraction is,the faster the apparent viscosity decreases with the increase of shear rate.Based on LS-DYNA platform,the established rheological model was used to simulate and analyze the magnetic pulse-assisted semi-solid brazing process,and the effectiveness of the model was verified by brazing experiment.

关 键 词：Zn15Al 半固态 高速剪切 毛细管流变仪 流变模型 

分 类 号：TG111[金属学及工艺—物理冶金]