Feng Xiaohui, Zhao Fuze, Jia Hongmin, Li Yingju, Yang Yuansheng
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
Ultrason Sonochem. 2018 Jan;40(Pt A):113-119. doi: 10.1016/j.ultsonch.2017.07.006. Epub 2017 Jul 6.
The formation of non-dendritic structure of Mg alloy solidified with ultrasonic treatment was investigated by numerical simulation and experiment. The models of nucleation and crystal growth involved the effects of ultrasonic cavitation and acoustic streaming were built. Based on the models, the grain refinement and the microstructure change from dendrite to non-dendritic structure of a Mg-Al alloy were numerically simulated by cellular automata method. The simulation and experimental results indicated that the ultrasonic cavitation strongly contributes to the grain refinement by improving nucleation, while the acoustic streaming is mainly responsible for the formation of non-dendritic structure.
通过数值模拟和实验研究了超声处理凝固的镁合金非枝晶结构的形成。建立了涉及超声空化和声流效应的形核与晶体生长模型。基于这些模型，采用元胞自动机方法对Mg-Al合金的晶粒细化以及从枝晶到非枝晶结构的微观组织变化进行了数值模拟。模拟和实验结果表明，超声空化通过促进形核有力地促进了晶粒细化，而声流主要负责非枝晶结构的形成。
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