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Heat Treatment of Magnesium Die Casting Alloys AZ91D and AM60B
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Abstract
In this study the solution annealed properties (T4) and solution annealed and aged properties (T6) of nominal 1/4-inch sections (6 mm) of die cast AZ91D and AM60B were studied, including the effects of aging time and temperature, and grainsize. An annealing time of 20 hours was found to be optimum for aging response and strength. Both the as-cast and heat treated properties of die cast specimens were superior to those of gravity-cast-and-heat-treated specimens. The T6 treatment did not improve the properties of die cast parts with nominal 6 mm sections due to grain growth induced by the T4 anneal. The effect of long time exposure to 250° F (120 °C) on the mechanical properties of as-cast die cast AZ91D and AM60B castings was also studied. It aged them to higher strengths than attainable by T6 treatments. Maximum strengthening occurred in 30-60 days; after 90 days overaging occurred.
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Citation
Suman, C., "Heat Treatment of Magnesium Die Casting Alloys AZ91D and AM60B," SAE Technical Paper 890207, 1989, https://doi.org/10.4271/890207.Also In
References
- Magnesium and Magnesium Alloys The International Magnesium Association Dayton OH
- Kaplan H. I. Basic Metallurgy of the Magnesium Die Casting Alloys Die Casting Engineer Nov-Dec 1986
- Standard Practice for Heat Treatment of Magnesium Alloys American Society for Testing and Materials Philadelphia, PA
- Heat Treating Magnesium Alloys ASM Metals Handbook 9th 747 4 1981
- Standard Specification for Magnesium Alloy Die Castings American Society for Testing and Materials Philadelphia, PA
- The Effect of Aging at 250°F on the Tensile Properties and Dimensional Stability of Solution Heat-Treated AZ91A, AZ63A, AZ91C, and A8A Alloy, Dow Chemical Company Metallurgical Report 16 Jun 53