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Production and Die Casting of Semi-Solid Magnesium Alloy AZ91D
Technical Paper
2002-01-0082
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Semi-solid forming is a relatively new process whereby an alloy with thixotropic characteristics at a temperature between solidus and liquidus is cast into a component in a mould. This technology is based on research originally carried out at MIT in the 1970s on rheological properties of semi-solid metals subjected to mechanical stirring. By not starting with a super-heated melt as in conventional liquid pressure die casting, semi-solid processing offers distinct advantages such as low cycle time, less porosity because of non-turbulent flow, improved die life and significantly better mechanical properties.
The success or failure in the production of a component largely depends on the temperature uniformity and microstructural homogeneity of the semi-solid thixotropic feedstock prior to injection. This paper describes results of work related to the preparation of AZ91D feedstock by electro-magnetic stirring combined with superheat reduction, reheating of this material to the thixotropic state by induction and semi-solid die casting a number of complex box-like components. The reheating was carried out in a single induction coil programmed to provide variable power input such that a low temperature gradient and a minimal liquid metal segregation in the billet feedstock were realized. The microstructure was monitored throughout the processing to achieve the desired semi-solid microstructure for successful die casting. The optimal casting parameters (metal temperature, ram velocity and metal pressure) for die casting the box-like components are given.
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Authors
- M. T. Shehata - Materials Technology Laboratory/CANMET, Natural Resources Canada
- V. Kao - Materials Technology Laboratory/CANMET, Natural Resources Canada
- E. Essadiqi - Materials Technology Laboratory/CANMET, Natural Resources Canada
- C. A. Loong - Industrial Materials Institute, National Research Council Canada
- C-Q Zheng - Industrial Materials Institute, National Research Council Canada
Citation
Shehata, M., Kao, V., Essadiqi, E., Loong, C. et al., "Production and Die Casting of Semi-Solid Magnesium Alloy AZ91D," SAE Technical Paper 2002-01-0082, 2002, https://doi.org/10.4271/2002-01-0082.Also In
References
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