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Effect of strontium and solidification rate on eutectic grain structure in an AI-13 wt% Si alloy |
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| Authors: | Liao Hengcheng Bi Juanjuan Zhang Min Ding Ke Jiang Yunfeng Cai Mingdong |
| Affiliation: | 1. Laboratory for Advanced Metallic Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211198China 2. Department of Mechanical and Electrical Engineering,Suzhou University of Science and Technology,Suzhou 215009,China 3. Bodycote Testing Group,Materials Testing Division,9925 Regal Row,Houston,TX 77040,USA |
| Abstract: | The influence of strontium addition and solidification rate on eutectic grain structure in a near-eutectic AI-Si alloy was investigated. The characteristic temperature of eutectic nucleation (TN),minimum temperature prior to recalescence (TM),and the growth temperature (TG) during cooling were determined by quantitative thermal analysis. All characteristic temperatures were found to decrease continuously with increasing Sr content and solidification rate. Microstructural analysis also revealed that the eutectic grain size decreases with increasing Sr content and solidification rate. Such eutectic grain refinement is attributed to the increased actual under-cooling ahead of the liquid/solid interface during solidification. |
| Keywords: | AI-Si alloys microstructure solidification eutectic grain strontium |
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