Effect of pouring temperature on fractal dimension of
primary phase morphology in semi-solid A356 alloy
(1. Jiangxi Nonferrous Metal Processing Engineering Research Center, Ganzhou 341000, China;
2. Faculty of Mechanical and Electronic Engineering, Jiangxi University of Science and Technology,
Ganzhou 341000, China;
3. School of Materials Science and Engineering, University of Science and Technology Beijing,
Beijing 100083, China)
2. Faculty of Mechanical and Electronic Engineering, Jiangxi University of Science and Technology,
Ganzhou 341000, China;
3. School of Materials Science and Engineering, University of Science and Technology Beijing,
Beijing 100083, China)
Abstract: The fractal dimensions of primary phase morphology in semi-solid A356 alloy prepared by low superheat pouring and slightly electromagnetic stirring were calculated, and the effect of pouring temperature on fractal dimension of primary phase morphology in semi-solid A356 alloy was researched. The results indicate that it is feasible to prepare semisolid A356 alloy slurry by low superheat pouring and slightly electromagnetic stirring, and there is an important effect of pouring temperature on the morphology and the grain size of the primary phase in semi-solid A356 alloy, in which the reduction of pouring temperature can obviously improve grain size and shape factor of primary phase in semi-solid A356 alloy under the condition of a certain stirring power. The primary phase morphology of semi-solid A356 alloy prepared by low superheat pouring and slightly electromagnetic stirring can be characterized by fractal dimension, and the primary phase morphology obtained by the different processing parameters has the different fractal dimensions. Solidification of semi-solid alloy is a course of change in fractal dimension.
Key words: semi-solid; fractal dimension; morphology; pouring temperature; A356 alloy