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Effect of solidification rate on the coarsening behavior of precipitate in rapidly solidified Al-Si alloy |
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| Authors: | Zhiyong Cai Chun Zhang Richu Wang Chaoqun Peng Ke Qiu and Naiguang Wang |
| Institution: | School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341001, China;School of Materials Science and Engineering, Central South University, Changsha 410083, China;School of Materials Science and Engineering, Central South University, Changsha 410084, China;School of Materials Science and Engineering, Central South University, Changsha 410085, China;School of Materials Science and Engineering, Central South University, Changsha 410086, China |
| Abstract: | 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. |
| Keywords: | Rapid solidification Solidification rate Super-saturated solutions Grain growth Aluminum Silicon alloy |
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