A method of manufacturing a heat resistant magnesium alloy, and its production method of heat-resis

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PROBLEM TO BE SOLVED : To provide a manufacturing method that provides a recycled heat-resistant magnesium alloy superior in corrosion resistance. SOLUTION : The method for manufacturing a heat-resistant magnesium alloy, includes : a melting step of heating recovered raw materials including recovered magnesium alloy members to melt the raw materials and obtaining a raw molten metal; an adjusting step of using the raw molten metal to obtain an adjusted molten metal of a magnesium alloy composition containing 0.2-5% of a heat-resistance improving element comprising one or more of Ca, Si, Sr or rare earth (R.E.), 1-11% Al, 0.5-5% Zn and 0.5% or less Cu, based on 100% by mass of whole of the raw molten metal; and a solidification step of cooling and solidifying the adjusted molten metal to obtain a recycled magnesium alloy, thereby obtaining the heat-resistant magnesium alloy comprising the recycled magnesium alloy and superior in corrosion resistance, wherein a moderate amount of Zn renders Cu, as a corrosion causative element, harmless. COPYRIGHT : (C)2012, JPO&INPIT