Influence of Different Rapid Injection Velocity on Forming Quality of Magnesium Alloy Vacuum Die Casting
Three groups of vacuum die-casting experiments for AZ91D magnesium alloy were carried out with a self-designed vacuum pumping system to investigate the effects of different rapid injection speeds on the mechanical proper-ties and microstructure of vacuum die-casting parts.The results indicate that the die castings fabricated by the vacuum pumping system exhibit complete shape and the better mechanical properties than ordinary die castings.When the rapid injection speed is 3 m/s,the surface of the die castings is easy to form cold shut and flow marks,and there are many shrinkage porosity and holes in the microstructure.When the rapid injection speed is 5 m/s,the die castings are prone to flash and there are many shrinkage holes in the microstructure.When the rapid injection speed is 4 m/s,the die-castings have a complete shape with a few shrinkage cavities in the microstructure.The tensile strength and the elonga-tion of the heat sink reach up to 226 MPa and 5.4%,respecively.
Magnesium AlloyProcessing ParameterVacuum Die Casting
NETL
NSTL
万方数据
维普
