{"title":"Enhancement of Mechanical Properties for Al-Mg-Si Alloy Using Equal Channel Angular Pressing","authors":"A. Nassef, S. Samy, W. H. El Garaihy","volume":97,"journal":"International Journal of Materials and Metallurgical Engineering","pagesStart":131,"pagesEnd":137,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10000442","abstract":"<p>Equal channel angular pressing (ECAP) of<br \/>\r\ncommercial Al-Mg-Si alloy was conducted using two strain rates.<br \/>\r\nThe ECAP processing was conducted at room temperature and at<br \/>\r\n250&deg;C. Route A was adopted up to a total number of four passes in<br \/>\r\nthe present work. Structural evolution of the aluminum alloy discs<br \/>\r\nwas investigated before and after ECAP processing using optical<br \/>\r\nmicroscopy (OM). Following ECAP, simple compression tests and<br \/>\r\nVicker&rsquo;s hardness were performed. OM micrographs showed that, the<br \/>\r\naverage grain size of the as-received Al-Mg-Si disc tends to be larger<br \/>\r\nthan the size of the ECAP processed discs. Moreover, significant<br \/>\r\ndifference in the grain morphologies of the as-received and processed<br \/>\r\ndiscs was observed. Intensity of deformation was observed via the<br \/>\r\nalignment of the Al-Mg-Si consolidated particles (grains) in the<br \/>\r\ndirection of shear, which increased with increasing the number of<br \/>\r\npasses via ECAP. Increasing the number of passes up to 4 resulted in<br \/>\r\nincreasing the grains aspect ratio up to ~5. It was found that the<br \/>\r\npressing temperature has a significant influence on the<br \/>\r\nmicrostructure, Hv-values, and compressive strength of the processed<br \/>\r\ndiscs. Hardness measurements demonstrated that 1-pass resulted in<br \/>\r\nincrease of Hv-value by 42% compared to that of the as-received<br \/>\r\nalloy. 4-passes of ECAP processing resulted in additional increase in<br \/>\r\nthe Hv-value. A similar trend was observed for the yield and<br \/>\r\ncompressive strength. Experimental data of the Hv-values<br \/>\r\ndemonstrated that there is a lack of any significant dependence on the<br \/>\r\nprocessing strain rate.<\/p>\r\n","references":"[1] Y. Estrin, and A. Vingoradov, Extreme Grain Refinement by Severe\r\nPlastic Deformation: A Wealth Of Challenging Science, Acta Materialia\r\n61, 2013, pp. 782-817.\r\n[2] X.Z. Liao, X.Z. Liao, Y. H. Zhao, E.J. Laverina, S.P. Ringer, Z. Horita,\r\nT.G. Langdon, and Y.T. Zhu, The Role of Stacking Faults and Twin\r\nBoundaries in Grain Refinement of A Cu\u2013Zn Alloy Processed by High-\r\nPressure Torsion, Materials Science and Engineering A 527, 2010, pp.\r\n4959-4966.\r\n[3] R.Z. Valiev and T.G. 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