Effect of Process Parameters on Microstructure and Properties ofMagnesium Alloy Radar Shell Die Casting

Abstract

The effect of technological parameters on the mechanical properties of Magnesium alloy radar shell was studied by orthogonal experiment. On the basis of orthogonal experiment, the effects of pouring temperature, mold temperature and injection speed on the mechanical properties and microstructure of the shell were studied respectively. The results showed that when the pouring temperature was 680 °C, the mold temperature was 200 °C and the injection speed was 3.5 m/s, the mechanical properties and microstructure of the die castings were the best. The best mechanical properties were as follows: tensile strength of 245MPa, elongation at break of 5.48%, Brinell hardness of 79.6HB. Finally, phase analysis of shell samples under the best parameters showed that Magnesium alloy was mainly composed of ï¡-Mg matrix and Mg-RE compounds distributed along the grain boundaries. The Mg-RE compounds were Al2RE phase, Al11RE3 phase.