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Metals 2019, 9(3), 303; https://doi.org/10.3390/met9030303

Microstructural Evaluation and Corrosion Resistance of Semisolid Cast A356 Alloy Processed by Equal Channel Angular Pressing

1
Centre for Materials Engineering and Smart Manufacturing, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Malaysia
2
Department of Mechanical Engineering, Faculty of Engineering, Benghazi University, 16063 Benghazi, Libya
3
Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Malaysia
4
Department of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Malaysia
*
Author to whom correspondence should be addressed.
Received: 21 December 2018 / Revised: 4 February 2019 / Accepted: 4 February 2019 / Published: 8 March 2019
(This article belongs to the Special Issue Casting and Forming of Advanced Aluminum Alloys)
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Abstract

As-cast and semisolid casting using a cooling slope A356 alloy were processed by equal channel angular pressing (ECAP) for Si and grain refinement. The ECAP was conducted at room temperature in a mold, with a channel angle of 120°, and this resulted in a significant size reduction of grain and Si particles from 170.5 and 4.22 to 23.12 and 0.71 µm, respectively, after six passes of heat-treated cooling slope casting, using the ECAP process. The hardness increased with ECAP processing, from 61 HV, for the as-cast alloy, to 134 Hv, after six passes of heat-treated cooling slope casting. The corrosion resistance of the alloy improved, from 0.042 to 0.0012 mmy−1, after the ECAP process. In this work both the strength and corrosion resistance of the ECAPed A356 alloys were improved with the application of the cooling slope process than without (i.e., from the as-cast condition). View Full-Text
Keywords: A356 alloy; cooling slope; ECAP; hardness; pitting corrosion A356 alloy; cooling slope; ECAP; hardness; pitting corrosion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Gebril, M.A.; Omar, M.Z.; Mohamed, I.F.; Othman, N.K. Microstructural Evaluation and Corrosion Resistance of Semisolid Cast A356 Alloy Processed by Equal Channel Angular Pressing. Metals 2019, 9, 303.

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