Effect of solidification rate on the coarsening behavior of precipitate in rapidly solidified Al-Si alloy

The gas-atomized Al-Si alloy powder with different particle sizes was subjected to isothermal annealing for understanding the effect of solidification rate on precipitation and growth Si crystals. The results show that Si precipitates grew more quickly in the small samples with a large solidificatio...

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Bibliographic Details
Published in:Progress in natural science 2016-08, Vol.26 (4), p.391-397
Main Authors: Cai, Zhiyong, Zhang, Chun, Wang, Richu, Peng, Chaoqun, Qiu, Ke, Wang, Naiguang
Format: Article
Language:English
Subjects:
alloy
Aluminum Silicon alloy
Grain growth
growth
Aluminum
Rapid
Rapid solidification
rate
Super-saturated
Silicon
Solidification rate
solidification
Solidification
solutions
Grain
Super-saturated solutions
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Summary:The gas-atomized Al-Si alloy powder with different particle sizes was subjected to isothermal annealing for understanding the effect of solidification rate on precipitation and growth Si crystals. The results show that Si precipitates grew more quickly in the small samples with a large solidification rate due to high interfacial energy. Moreover, these Si crystals had a tendency to form a quasi-spherical shape after annealing at a low temperature or for a short holding time. Coarsening of the Si precipitates during annealing was examined using a LSW equation. Thermal stability of the rapidly solidified alloy was significantly influenced by its original microstructure as a result of high solidification rate. Furthermore,more serious clustering of Si-Si phase was also observed in the small samples, attributed to the rapid coarsening of the Si phases.
ISSN:1002-0071
DOI:10.1016/j.pnsc.2016.08.002