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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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  • 分类：TG146.2+1[金属学及工艺—金属材料;一般工业技术—材料科学与工程;金属学及工艺—金属学]
  • 作者机构：[1]Laboratory for Advanced Metallic Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211198China Laboratory for Advanced Metallic Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211198China Laboratory for Advanced Metallic Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211198China Laboratory for Advanced Metallic Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211198China Department of Mechanical and Electrical Engineering,Suzhou University of Science and Technology,Suzhou 215009,China Bodycote Testing Group,Materials Testing Division,9925 Regal Row,Houston,TX 77040,USA
  • 相关基金：This work was financially supported by the National Natural Science Foundation of China under grant No.50771031 and the Early Research Foundation of Southeast University under grant No. XJ0612238.
作者： Liao Hengcheng Bi Juanjuan Zhang Min Ding Ke Jiang Yunfeng Cai Mingdong[1]
关键词： AI-Si, alloys, microstructure, SOLIDIFICATION, EUTECTIC, GRAIN, STRONTIUM
中文摘要：

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.

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