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Influence of Severe Plastic Deformation on Mechanical Properties of an AA5024 Alloy

Abstract : The paper reports on the effect of severe plastic deformation on mechanical properties of an Al-4.57Mg-0.35Mn-0.2Sc-0.09Zr (in wt. pct.) alloy processed by equal channel angular pressing followed by cold rolling (CR). The sheets of the 5024 alloy with coarse grained (CG) structure exhibited a yield stress (YS) near 410 MPa and an ultimate tensile strength (UTS) of 480 MPa, while the YS and UTS of this material with ultrafine-grained (UFG) structure increased to 530 and 560 MPa, respectively. On the other hand, the elongation to failure decreased by a factor of 2 and 4 after CR and CR following ECAP, respectively. It was shown that dislocation strengthening attributed to extensive CR plays a major role in achieving high strength of this alloy. Besides these macroscopic characteristics, jerky flow caused by the Portevin-Le Chatelier (PLC) instability of plastic deformation was examined. The formation of UFG structure results in a transition from mixed type A+B to pure type B PLC serrations. No such effect on the serrations type was observed after CR.
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https://hal.univ-lorraine.fr/hal-03290509
Contributor : Jérôme Slowensky <>
Submitted on : Monday, July 19, 2021 - 1:18:11 PM
Last modification on : Tuesday, July 20, 2021 - 3:41:18 AM

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Anna Mogucheva, Diana Yuzbekova, Tatiana Lebedkina, Mikhail Lebyodkin, Rustam Kaibyshev. Influence of Severe Plastic Deformation on Mechanical Properties of an AA5024 Alloy. Materials Science Forum, Trans Tech Publications Inc., 2016, 879, pp.1317-1322. ⟨10.4028/www.scientific.net/MSF.879.1317⟩. ⟨hal-03290509⟩

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