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Practice the routine production of magnesium alloy melt magnesium and oxygen have a strong affinity , and coupled with magnesium has a high vapor pressure , the control problem in the safe production , and therefore the need to develop new molding process to solve these problems , including magnesium alloy semi-solid forming good solution to these problems . In this paper, AZ91D magnesium alloy crumbs by pressing into blocks , and then isothermal heat treatment method AZ91D magnesium alloy semi-solid billet prepared on AZ91D magnesium alloy semi-solid thixotropic flow properties forming depth test research and theoretical analysis . This paper studies the heat treatment process , isothermal temperature of semi-solid , semi-solid Isothermal time and location of the microstructure of the semi - solid billet . Semi-solid isothermal temperature of 570 ℃ , the grain spheroidization basically completed the round particles , the particle size distribution is more uniform , higher rate of liquid phase , very little particle cluster phenomenon , its viscosity is very small , conducive to semi- solid forming . 570 ℃ semi-solid isothermal time of 30min when the grain is basically grew up completely , grain ball better , thinning , low solid fraction . Therefore , the optimal parameters and other heat treatment at 570 ℃ for 30min . Isothermal heat treatment process parameters , the best position of the core part of the sample center organized by the Ministry of ball rate , liquid rate is higher, round particles , the particle size distribution is relatively uniform . Isothermal heat treatment experiments to study the optimum process for semi-solid flow test , analysis of semi-solid isothermal time performance of AZ91D magnesium alloy semi-solid thixoforming flow AZ91D magnesium alloy organization and mechanical properties impact. 570 ℃ semi-solid isothermal 30min AZ91D magnesium alloy semi- solid slurry fluidity best magnesium alloy semi - solid slurry can fill the entire cavity , and magnesium alloy semi-solid structure can be maintained , and can be further refinement . Almost mechanical properties of AZ91D magnesium alloy semi-solid forming the mechanical properties of conventional magnesium alloy forming parts .
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