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PROBLEM TO BE SOLVED : To provide an Mg alloy which has heat resistance under an environment of high temperature up to 200°C and does not contain RE (rare earth metal). SOLUTION : The Mg alloy is prepared by adding 5-7 mass% aluminum (Al), 1-5 mass% barium (Ba) and 1-10 mass% tin (Sn). COPYRIGHT : (C)2010, JPO&INPIT