期刊
ULTRASONICS SONOCHEMISTRY
卷 40, 期 -, 页码 113-119出版社
ELSEVIER
DOI: 10.1016/j.ultsonch.2017.07.006
关键词
Numerical simulation; Dendrite growth; Ultrasonic field; Mg alloy
资金
- National Natural Science Foundation of China [51274184]
- National Key Research and Development Program of China [2016YFB0301105]
- Guangdong Science and Technology Project [2013B091300016]
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.
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