Effects of Different Die Casting Processes on AE44 Magnesium Alloy
To understand the relationship between process-microstructure-mechanical properties of AE44 magnesium alloy high-pressure die castings,three-dimensional reconstruction and two-dimensional characterization were per-formed on high-pressure die castings produced under different process parameters.The microstructure characterization indicates that the formation of shrinkage pores is closely related to ESCs,which is mainly controlled by low and slow injection rates in the compression chamber and fast and slow injection rates.Casting pressure can significantly reduce the porosity of the core by increasing the feeding capacity of liquid metal.The simulation of the filling process shows that the central position of the bar sample is filled firstly,followed by the position near the gate,and accompanied by a strong turbulence.The tensile fracture indicates that the tearing ridges mainly evolve from the slip bands of ESCs.The quantity and distribution of ESCs determine the fracture behavior of castings.
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