Microstructure and mechanical properties with different sintering temperature of AZ91D alloy

Abstract

The regulation of sintering temperature in spark plasma sintering enables the achievement of grain refinement, phase control, and performance enhancement in the preparation of AZ91D magnesium alloy. This study investigates the influence of sintering temperature on microstructural evolution and mechanical properties of the AZ91D alloy. Microstructural analysis was conducted using scanning electron microscopy, electron backscatter diffraction, and X-ray diffraction. Microscopic structures and mechanical behaviors were examined through hardness and tensile tests. Elevated sintering temperatures resulted in reduced secondary phase content, leading to a decrease in mechanical performance. The alloy exhibited optimal mechanical properties at 320°C. The nanoparticle coarsening process and particle evolution during sintering were simulated using phase field methods. By optimizing the sintering temperature, precise control over microstructural and textural evolution can be achieved, facilitating the attainment of desired hardness levels and mechanical properties.