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Study of the Portevin-Le Chatelier (PLC) Characteristics of a 5083 Aluminum Alloy Sheet in Two Heat Treatment States

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Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, No. 3–11, Wenhua road, Heping district, Shenyang 110819, China
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School of Materials Science & Engineering, Northeastern University, No. 3–11, Wenhua road, Heping district, Shenyang 110819, China
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Department of Applied Science, University of Quebec at Chicoutimi, 555 Boulevard de l’Université, Chicoutimi, QC G7H2B1, Canada
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Author to whom correspondence should be addressed.
Materials 2018, 11(9), 1533; https://doi.org/10.3390/ma11091533
Received: 12 July 2018 / Revised: 19 August 2018 / Accepted: 21 August 2018 / Published: 25 August 2018
(This article belongs to the Section Structure Analysis and Characterization)
In the present work, the role of Mg atoms in the form of either Mg clusters or β phase on the moving dislocations in 5083 aluminum alloy sheet were investigated by comparing the plastic flow behavior and Portevin-Le Chatelier (PLC) character in annealed and quenched conditions. It is found that the tensile strength of quenched sheets at different strain rates is slightly higher than those under annealed condition while the yield strength at both conditions is similar. In annealed sheets, the yield plateau was clearly observed at all tested strain rates with a strain less than 0.012, and its width increased with the increasing strain rate. However, no yield plateau was observed in quenched sheets. On the other hand, the characters of PLC are greatly varied with applied conditions and strain rate. Generally, annealed sheets have a higher waiting time, but lower critical strain/stress at lower strain rate (~1 × 10−4 s−1), but they are similar at a higher strain rate (1 × 10−2 s−1). However, the falling time at both annealed and quenched conditions are almost the same at tested strain rates. View Full-Text
Keywords: 5083 aluminum alloy; PLC characteristic; annealed; quenched; strain rate 5083 aluminum alloy; PLC characteristic; annealed; quenched; strain rate
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Tian, N.; Wang, G.; Zhou, Y.; Liu, K.; Zhao, G.; Zuo, L. Study of the Portevin-Le Chatelier (PLC) Characteristics of a 5083 Aluminum Alloy Sheet in Two Heat Treatment States. Materials 2018, 11, 1533.

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