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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>
Azizieh, M.,Sadeghi Alavijeh, A.,Abbasi, M.,Balak, Z.,Kim, H.S. Elsevier Science Publishers 2016 Materials chemistry and physics Vol.170 No.-
In this paper, microstructure and mechanical properties of dissimilar friction stir welds of AA1100 and AZ31 were investigated to understand the effects of rotational and travel speed as well as pin position. The tensile results of welded samples revealed that the sound welds were formed when the stirring pin deviated from the centreline to the AZ31 side. The X-ray diffraction shows that Al<SUB>3</SUB>Mg<SUB>2</SUB> and Al<SUB>12</SUB>Mg<SUB>17</SUB> intermetallics formation occurs in the stir zone during the welding process. High hardness of these intermetallic phases increased the hardness of the stir zone to 110 Hv. The best tensile results were obtained in the sample processed in the range of 28-32 (rev/mm) rotational to travel speed ratio.