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Azizieh, Mahdi,Mazaheri, Mojtaba,Balak, Zohre,Kafashan, Hosein,Kim, Hyoung Seop Elsevier 2018 Materials science & engineering. properties, micro Vol.712 No.-
<P><B>Abstract</B></P> <P>In this study, in-situ magnesium matrix surface nanocomposites were prepared by adding Al particles to an as-cast pure Mg ingot using friction stir processing (FSP). The effects of the number of FSP passes, tool design, rotational and travel speeds were investigated. Microstructural investigations showed a significant grain refinement owing to dynamic recrystallization. According to scanning electron microscopy examinations and X-ray diffraction results, Al<SUB>12</SUB>Mg<SUB>17</SUB> intermetallics were formed during FSP due to chemical reaction at the Al-Mg interface. As a result of severe plastic deformation, the intermetallic particles formed at nanometre size. X-ray diffraction showed that the crystalline size of intermetallic particles reached ≤ 50nm, due to high material flow during FSP. The intermetallic formation and grain refining led to an increase in the hardness values 1.5–3 times) that of the as-cast pure Mg ingot.</P>