CORRODIBLE DOWNHOLE ARTICLE

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This invention relates to a magnesium alloy suitable for use as a corrodible downhole article. The magnesium alloy comprises : (a) 11-15wt% Y, (b) 0.5-5wt% in total of rare earth metals other than Y, (c) 0-1wt% Zr, (d) 0.1-5wt% Ni, and (e) at least 70wt% Mg. The invention also relates to a downhole tool comprising the magnesium alloy, a method for producing the magnesium alloy, and a method of hydraulic fracturing comprising the use of a downhole tool comprising the magnesium alloy.