BIODEGRADABLE MAGNESIUM ALLOY

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A magnesium alloy includes a rare earth element alloy component comprising yttrium, a rare earth element (REE) other than yttrium, and a balance of magnesium. The rare earth element other than yttrium may comprise two or more rare earth elements other than yttrium. The rare earth element other than yttrium may include a heavy rare earth element and a light rare earth element. The alloy may include about 4-10 wt-% yttrium, 0-9 wt-% heavy REE, 0-7 wt-% light REE, 0-7 wt-% zinc, 0-0.7 wt-% zirconium, and a balance of magnesium. The balance of magnesium may be in an amount up to 90 wt-%.