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A magnesium - rare earth - yttrium - zinc alloy consists of 0.2-1.5% by weight zinc and rare earth(s) (RE) and yttrium in amounts which fall within a quadrangle defined by lines AB, BC, CD and DA wherein : A is 1.8% RE - 0.05% Y, B is 1.0% RE - 0.05% Y, C is 0.2% RE - 0.8% Y, and D is 1.8% RE - 0.8% Y.