The Process and Mechanisms of Non-Dendritic Structure Formation in Semi-Solid Processing of Aluminum
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Abstract
porosity, enhance dimensional accuracy, and improves the mechanical properties of the final product. Currently, the most commonly used semi-solid forming techniques are Thixocasting and Rheocasting. Thixocasting involves reheating alumium feed stocks containing a globular microstructure to a semi-solid state and then injectecting it into the mold. In contrast, Rheocasting directly tranforms molten aluminum into a semi-solid state before shaping. Both sophisticated methods effectively minimize defects and enhance the strength and quality of the final product. This review article provides an overview of the semi-solid casting process of aluminum, the mechanisms of non-dendritic structure formation, and the significant parameters that influence microstructure, mechanical properties, and product quality. The knowledge presented is crucial for the development of semi-solid casting processes in both research and industrial applications, particularly in the field of aluminum alloy casting.
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