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Open AccessArticle

Semi-Continuous Equal-Channel Angular Extrusion and Rolling of AA5083 and AZ31 Alloys

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Engineered Performance Materials (EPM), 11228 Lemon Rd., Suite-A, Whitmore Lake, MI 48189, USA
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Weapons and Materials Research Directorate, US Army Research Laboratory, Aberdeen Proving Ground, MD 21005, USA
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Hopkins Extreme Materials Institute, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA
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Author to whom correspondence should be addressed.
Metals 2019, 9(10), 1035; https://doi.org/10.3390/met9101035
Received: 13 August 2019 / Revised: 16 September 2019 / Accepted: 18 September 2019 / Published: 24 September 2019
This paper describes a new modification of equal-channel angular extrusion for the “pass-by-pass” semi-continuous (sc-ECAE) processing of lightweight alloys. Sc-ECAE leads to a multifold increase in productivity and decrease in costs, providing a technical basis for the commercialization of severe plastic deformation (SPD) on a large scale with massive volume production. The evolution of the structure and properties are analyzed for an aluminum alloy (AA) 5083 and a magnesium alloy AZ31 as model materials representing, respectively, the structural refinement under severe plastic deformation (SPD) via strain-induced formation of new grain boundaries and via dynamic recrystallization. For the first alloy, the microstructure after sc-ECAE is formed via ultrafine sub-grains, which are further transformed into sub-micrometer grains during post-ECAE rolling. The preliminary solution treatment of AA5083 is an important stabilizing factor for the achievement of high mechanical properties. For the second alloy, optimized sc-ECAE results in a remarkable structural refinement, and a good balance of properties is obtained with a low number of passes. However, additional rolling in the latter case leads to a degradation of the structure and properties. View Full-Text
Keywords: severe plastic deformation; equal-channel angular extrusion; structure evolution; grain refinement; mechanical properties severe plastic deformation; equal-channel angular extrusion; structure evolution; grain refinement; mechanical properties
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MDPI and ACS Style

Segal, V.; Reznikov, S.V.; Murching, N.; Hammond, V.H.; Kecskes, L.J. Semi-Continuous Equal-Channel Angular Extrusion and Rolling of AA5083 and AZ31 Alloys. Metals 2019, 9, 1035.

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