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Thixomolded Magnesium: It’s Status and Model Relating Structure and Solid State Properties

Journal: The Third International Conference on Semi-Solid Processing of Alloys and Composites June 13-15, 1994
Author: R. Carnahan

Thixomolding produces net-shape parts from Magnesium alloys in an environmentally friendly one step process. Unlike other semi-solid processes, an as cast feedstock is introduced into the machine at room temperature. In a single step the room temperature alloy is transformed to the thixotropic rheological state accumulated to a desired volume, and injected under high pressure and velocity into a closed die producing the net shape molding. L. Pasternat, et al. (1992) have previously given a comprehensive review of this process and the Thixomolding machine. Since that time, an intensive development program has been carried out using that machine. It has provided an invaluable tool for the development of a mechanical properties data base and has permitted the evaluation of its potential to process a variety of commercially important Magnesium die casting alloys. A wide range of prototyping investigations on commercial products have been carried out, as well as large volume sub-scale manufacturing studies. It has also been used to investigate the increasingly important aspects of direct recycling. This paper will conclude with a discussion of the microstructure of Thixomolded Magnesium and a model relating the mechanical properties of the solid state to the microstructure for volume fraction solids, fs, up to 0.65 for the semi-solid state.

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