Evaluation of Structural and High-Temperature Magnesium Alloys 2002-01-0080

The automobile and light truck industries are increasingly using more magnesium castings in structural and high-temperature applications. Unfortunately, the castability and mechanical behavior of the commonly used alloys have not been compared under similar conditions. Further, new alloys intended for high-temperature applications (Noranda AJ50X, Noranda AJ52X, Hydro AS21X, Dead Sea Magnesium MRI-153) are being promoted, but their casting and mechanical behavior are not well known.

Therefore, five high temperature magnesium alloys (AJ50X, AJ52X, AS21X, MRI-153 and AE42), two magnesium alloys more commonly used for structural applications (AM50A and AM60B) and one aluminum alloy (383) were melted and cast at the INTERMET Monroe City Plant (a production high-pressure die casting facility). The castings were subsequently evaluated at the INTERMET Technical Center and outside testing laboratories. This paper documents the casting behavior and the results of tests that determined numerous mechanical properties (RT and elevated temperature tensile, RT and elevated temperature compression, RT fatigue, impact and corrosion). The properties presented in this paper will help provide the necessary data for engineers and designers to use these lightweight materials efficiently and effectively.