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Microstructure heterogeneity and deformation behavior of high pressure die casting Al-6Si-Mg alloy
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DOI：10.1016/j.engfracmech.2026.112100.png)
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Abstract
En 中文
The different cooling rates from surface to central region in high pressure die casting (HPDC) process induce the formation of microstructure heterogeneity. In this study, the mechanism of microstructure heterogeneity formation was systematically revealed, and the deformation behavior of the hetero-structured HPDC castings at different strains was systematically studied using in-situ electro backscatter diffraction (EBSD). The results revealed that the microstructure heterogeneity of the hetero-structured HPDC castings could be summarized into the following three types: the grain size heterogeneity from surface layer to central region, which is induced by the different cooling rates, the interaction between the clustered externally solidified crystals (ESCs) and the related shrinkage-porosity, and the ESCs with developed dendritic morphology. During the tensile deformation, the dislocation density in the skin layer is higher than the central region at the same strain because of the small size of alpha II-Al grains could provide sufficient space for the dislocation motion and easily induce the aggregation. The shrinkage-porosity is more detrimental than gas-porosity for the deformation of hetero-structured HPDC castings. The crack was nucleated at the interfacial boundary region of the shrinkage-porosity. At the crack propagation stage, the propagation route was significantly dependent on the morphology of ESCs. The ESCs with developed dendritic morphology were easily torn by cracks during deformation. However, the cracks propagated along the interfacial boundary region of the ESCs with relative regular morphology.
Keywords:
High pressure die casting
Microstructure heterogeneity
Deformation behavior
Externally solidified crystals
Porosity
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