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Journal of Materials Engineering and Performance

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25-01-2016

The Effect of Electric Current and Strain Rate on Serrated Flow of Sheet Aluminum Alloy 5754

Authors: Kunmin Zhao, Rong Fan, Limin Wang

Published in: Journal of Materials Engineering and Performance | Issue 3/2016

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Abstract

Electrically assisted tensile tests are carried out on sheet aluminum alloy AA5754 at electric current densities ranging from 0 to 30.4 A/mm² and strain rates ranging from 10⁻³ to 10⁻¹ s⁻¹. The strain rate sensitivity and the serrated flow behavior are investigated in accordance with dynamic strain aging mechanism. The strain rate sensitivity changes from negative to positive and keeps increasing with current density. The tendency toward serrated flow is characterized by the onset of Portevin-Le Chatelier (PLC) instabilities, which are influenced by strain rate, temperature, and electric current. The evolutions of three types of serrated flow are observed and analyzed with respect to strain rate and current density. The magnitude of serration varies with strain rate and current density. The serrated flow can be suppressed by a high strain rate, a high temperature, or a strong electric current. The threshold values of these parameters are determined and discussed. Conventional oven-heated tensile tests are conducted to distinguish the electroplasticity. The flow stress reduces more in electrically assisted tension compared to oven-heated tension at the same temperature level. The electric current helps suppress the serrated flow at the similar temperature level of oven-heating.

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Title: The Effect of Electric Current and Strain Rate on Serrated Flow of Sheet Aluminum Alloy 5754
Authors: Kunmin Zhao
Rong Fan
Limin Wang
Publication date: 25-01-2016
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 3/2016
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-016-1913-y

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