Using the phase field method to investigate microstructural evolution of semi-solid 357.0 slurries

Qu, Wenying1; Li, Daquan1; Guo, Zhipeng2; Luo, Min1; Zhang, Fan1; Midson, Stephen P.3; Hu, Xiaogang4; Zhang, Yongzhong1

10.4028/www.scientific.net/SSP.285.367

2019

16629779

15th International conference on Semi-Solid Processing of Alloys and Composites, S2P 2018

285 SSP

367-372

Shenzhen, China

Trans Tech Publications Ltd

Semi-solid aluminum slurries have globular grains, different from traditional dendritic solidification microstructures. The mechanism responsible for the formation of these globular grains is still in dispute. Some researchers suggest that the globular grains are formed by fractured dendrites, while others report it is due to copious nucleation. This study will model the growth of the α-Al phase during the production of semi-solid slurries using the swirled equilibrium enthalpy device (SEED) process, where liquid alloy with a low superheat is poured into a steel crucible and swirled within the semi-solid region. Experimental observations have shown that the final microstructure of the slurry produced by the SEED process is relatively non-uniform, with large dendrites at surface and fine spherical particles at the center. Open source code for the phase field method has been adopted to simulate the different microstructural evolution for semi-solid alloy 357.0. The effect of localized temperatures under isothermal condition on the morphology of the α-Al particles has been investigated according to the special conditions of the SEED process. In addition, suggestions for modifying the slurry production to achieve more uniform microstructure are discussed.
© 2019 Trans Tech Publications, Switzerland.

其他

EI

National Basic Research Program of China (973 Program)[2016YFB0301001] ; Shenzhen Science and Technology Innovation Commission[]

20190306384524

Dendrites (metallography) ; Microstructural evolution ; Open source software ; Open systems

Metallography:531.2 ; Computer Software, Data Handling and Applications:723 ; Physical Chemistry:801.4

EV Compendex

1.General Research Institute for Non-ferrous Metals, Beijing; 100088, China
2.School of Materials Science and Engineering, Tsinghua University, Beijing; 100084, China
3.Colorado School of Mines, Golden; CO; 80401, United States
4.Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen; 518055, China

Qu, Wenying,Li, Daquan,Guo, Zhipeng,et al. Using the phase field method to investigate microstructural evolution of semi-solid 357.0 slurries[C]:Trans Tech Publications Ltd,2019:367-372.