Papers by Author: Mei Yan Huang

Abstract: Semisolid A356 alloy was prepared by low superheat pouring. The effects of La as a kind of refinement on the size and morphology of the primary phase in semisolid A356 alloy were researched. The results indicated that semisolid A356 alloy contained certain La addition with particle-like and rosette-like primary phase could be prepared by low superheat pouring. The size and morphology of primary phase in A356 alloy are markedly improved by the suitable addition of La. The refining mechanism of La on the size and morphology of the primary phase in semisolid A356 alloy were concerned with the eutectic reaction induced by La in the alloy.

Abstract: The semisolid A356 alloy slurry was prepared by low superheat pouring and slightly electromagnetic stirring (LSPSES). The effects of frequency conversion on the slurry were researched for energy-saving. The results indicated that it was feasible to prepare the slurry with particle primary phases by LSPSES. The application of frequency conversion technique into the preparation of the slurry by LSPSES was favorable to satisfying the requirements of rheo-forming and reducing the energy consumption.

Abstract: Mg₂Si reinforced hypereutectic Al-Si in-situ composite was prepared and the effects of the isothermal holding temperature and time on Mg₂Si in the composite were researched. The results showed that there were the important effects of holding temperature and time in the solid-liquid phase region of the Al-Si alloy on the size and morphology of Mg₂Si. The size and morphology of Mg₂Si became smaller and round with the rising of the holding temperature and prolonging of the holding time. The suitable technology in the test was obtained, in which when being held at 615°C for 300s, the size of Mg₂Si decreased to 20.54μm and the shape factor of Mg₂Si reached about 0.67.

Abstract: Evolution characteristics of primary phase in A356 alloy at the different isothermal holding temperatures and time were investigated. The results showed that there were the effects of the isothermal holding temperature and time on the evolution of primary phase, and microstructure changed from dendritic-like to rosette-like, and then to particle- or globular-like with the decrease of holding temperature. The suitable technology in the test was obtained, in which when being held at 600°C for 5min, the roundness and size of primary became better.