Research on fractal characteristics of primary phase morphology in semi-solid A356 alloy  

作　　者：Zheng LIU Xiaomei LIU Chunhui HU Weimin MAO 

机构地区：[1]Faculty of Mechanical and Electronic Engineering, Jiangxi University of Science and Technology,Ganzhou 341000, China [2]Jiangxi Nonferrous Metal Processing Engineering Research Center, Ganzhou 341000, China [3]School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing100083, China

出　　处：《Acta Metallurgica Sinica(English Letters)》2009年第6期421-428,共8页金属学报（英文版）

基　　金：supports of the National Natural Science Foundation of China (No.50374012);the Natural Science Foundation of Jiangxi Province(No.0650047);the Science and Technology Program of the Education Department of Jiangxi Province (No.GJJ09229)

摘　　要：Semi-solid slurry of A356 alloy was prepared by low superheat pouring and slightly electromagnetic stirring, and the fractal characteristics of morphology in semi-solid primary phase was researched. The fractal dimensions of primary phase morphology in the semi-solid A356 alloy were calculated by the program written to calculate the fractal dimensions of box-counting in the image of solid phase morphology in semi-solid metal slurry. The results indicated that the morphology of primary phase in semi-solid A356 prepared by low superheat pouring and slightly electromagnetic stirring is characterized by fractal dimension, and the primary phase morphology obtained by the different processing parameters has different fractal dimensions. The morphology of primary phase at the different position of ingot has different fractal dimensions, which reflected the effect of solidified conditions at different positions in the same ingot on the morphology of semi-solid primary phase. Solidification of semi-solid alloy is a course of change in fractal dimension.Semi-solid slurry of A356 alloy was prepared by low superheat pouring and slightly electromagnetic stirring, and the fractal characteristics of morphology in semi-solid primary phase was researched. The fractal dimensions of primary phase morphology in the semi-solid A356 alloy were calculated by the program written to calculate the fractal dimensions of box-counting in the image of solid phase morphology in semi-solid metal slurry. The results indicated that the morphology of primary phase in semi-solid A356 prepared by low superheat pouring and slightly electromagnetic stirring is characterized by fractal dimension, and the primary phase morphology obtained by the different processing parameters has different fractal dimensions. The morphology of primary phase at the different position of ingot has different fractal dimensions, which reflected the effect of solidified conditions at different positions in the same ingot on the morphology of semi-solid primary phase. Solidification of semi-solid alloy is a course of change in fractal dimension.

关 键 词：SEMI-SOLID Morphology of primary phase FRACTAL A356 alloy 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TP391.41[金属学及工艺—金属材料]