Microstructure Stability and Creep Strength in a Die-Cast AX52 Magnesium Alloy
نویسندگان
چکیده
Superior creep strength of a heat resistant AX52 magnesium alloy is ascribed to the grain boundary eutectic Al2Ca phase covering the primary -Mg grains. The eutectic phase is stable in morphology at temperatures below 473K, while it collapses during long term exposure at temperatures higher than 473K. The microstructural change of the alloy during high temperature exposure is characterized by the decrease in the grain boundary coverage by the eutectic phase. The creep strength of the alloy decreases with the decrease in the grain boundary coverage, and the correlation between the creep strength and the grain boundary coverage is discussed.
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