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High Purity Magnesium Die Casting Alloys: From Ingot to Cast Product
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English
Abstract
The current strong interest in magnesium alloy die castings for automotive applications relies heavily on the “High Purity” concept. The basic knowledge of the detrimental effects of heavy element impurities on the general corrosion of magnesium alloys has been known for more than 60 years. However, it was not until the 1980's that the full potential of high purity alloys was recognized. The level of impurities (in particular, copper, nickel and iron) that can be tolerated in a die cast part exposed to a corrosive environment necessitates careful control throughout the complete manufacturing process, from ingot to finished product. In the present paper, some basic principles for the production of high purity alloys and the influence of subsequent melt handling practice in the die casting shop are discussed.
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Citation
Holta, O., Westengen, H., and Albright, D., "High Purity Magnesium Die Casting Alloys: From Ingot to Cast Product," SAE Technical Paper 940413, 1994, https://doi.org/10.4271/940413.Also In
References
- Beck A. Schmidt W. 1929
- Hanawalt J. D. Nelson C. E. Peloubet J. A. Trans. AIME 147 1942 273 “Corrosion Studies of Magnesium and its Alloys.”
- ASTM Standards B 93/B 93M - 92 Standard Specification for Magnesium Alloys in Ingot Form for Sand Castings, Permanent Mold Castings, and Die Castings ASTM Standards B 94 - 93 Standard Specification for Magnesium-Alloy Die Castings
- Reichek K. N. Clark K. J. Hillis J. E. “Controlling the Salt Water Corrosion Performance of Magnesium AZ91 Alloy,” SAE Technical Paper 850417 1985
- Thorvaldsen A. Aliravci C. A. “Solubility Studies of Magnesium in Liquid Mg-Al Alloys,” Proc. Can. Inst. Met. Annual Conference 1992
- Holta O. et. al “Two-Furnace Melting System for Magnesium,” Transactions North American Die Casting Association Paper T93-023 1993