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An in situ displacement reaction was used to prepare an Al–12 wt% Sn nanocomposite alloy from mechanically alloyed Al–SnO2–MgH2. The nanoscaled Sn phase was mostly 30–50 nm in size and was distributed uniformly in the Al matrix. The wear properties of the Al–SnO2–MgH2 composite were enhanced significantly compared to those of an Al–Sn–MgH2 composite. These improvements stemmed from the high-strength...