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Microstructure and mechanical properties of in situ Mg2Si/AZ91 composites fabricated using silica fume as the Si source were investigated. The composites contained α-Mg, network Mg17Al12, lamellar Mg17Al12, coarse polygonal Mg2Si and needle-type Mg2Si. Mischmetal modification eliminated the coarse polygonal Mg2Si and resulted in a decreased amount of lamellar Mg17Al12 and refined matrix grain size...
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