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

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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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Acknowledgments

This research was supported by the National Natural Science Foundation of China (11472072, 51571048) and Dalian University of Technology’s Major Project Fund (DUT15ZD103). A sincere thank you is extended to Mr. Mitchell Clauson for proof reading and editing the manuscript.

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Authors and Affiliations

  1. School of Automotive Engineering, State Key Lab of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, 116024, China

    Kunmin Zhao, Rong Fan & Limin Wang

  2. Institute of Industrial and Equipment Technology, Hefei University of Technology, Hefei, 230601, China

    Kunmin Zhao

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  1. Kunmin Zhao
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  2. Rong Fan
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  3. Limin Wang
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Correspondence to Rong Fan.

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Zhao, K., Fan, R. & Wang, L. The Effect of Electric Current and Strain Rate on Serrated Flow of Sheet Aluminum Alloy 5754. J. of Materi Eng and Perform 25, 781–789 (2016). https://doi.org/10.1007/s11665-016-1913-y

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  • DOI: https://doi.org/10.1007/s11665-016-1913-y

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