A Model for Evaluation of Grain Sizes of Aluminum Alloys with Grain Refinement Additions

作     者：Zhongwei CHEN Zhi HE Wanqi JIE 

作者机构：State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi＇an 710072 China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2007年第23卷第5期

页      面：619-622页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：国家重点基础研究发展计划(973计划)(G2000067202-1) 

主　　题：Grain refinement Constitutional undercooling Nucleation Aluminum alloys 

摘      要：Based on the assumption that the nucleation substrates are activated by constitutional undercooling generated by an adjacent grain growth and solute distribution during the initial solidification, a model for calculation of the grain size of aluminum alloys with the grain refinement is developed, where the nucleation is dominated by two parameters, i.e. growth restriction factor Q and the undercooling parameter P. The growth restriction factor Q is proportional to the initial rate of constitutional undercooling development and can be used directly as a criterion of the grain refinement in the alloys with strong potential nucleation particles. The undercooling parameter P can be regarded as the maximum of constitutional undercooling △Tc. For weak potential nucleation particles, the use of RGS would be more accurate. The experimental data of the grain refinement of pure aluminum and AlSi7 alloys are coincident predicted results with the model.