电脉冲拉伸下5052铝合金的变形行为及微观组织和织构演变

doi:10.11896/cldb.19110004

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Abstract The influence of pulsed current on the deformation behavior, microstructure and texture evolution of 5052 aluminum alloys was studied by X-ray diffraction (XRD) and transmission electron microscope (TEM) during electropulsing tensile tests with different current densities. From the experimental results, the engineering stress-strain curve with electropulsing shows a unique ratchet shape and characteristic of dynamic recrystallization, which is totally different from the work hardening curve without electropulsing. The increase of current density can result in only a little decrease of the tensile strength, but greatly improve the plasticity, such as, the tensile strength only decreases from 238 MPa to 210 MPa, and the total elongation is improved from 9% to 24% at a current density of 16.80 A/mm². Moreover, the orientation distribution function (ODF) maps show that deformation texture is dominant in the tensile specimens without electropulsing, while deformation texture is weakened and it transforms into recrystallized Cube {100}〈001〉texture in tensile specimens with electropulsing. Transmission electron microscopy (TEM) shows that there is a large amount of recrystallization in the tensile specimens with electropulsing, while plenty of cell structures with high density dislocations are observed in the tensile specimen without electropulsing. The texture evolution show that the imposed electric pulse contributes to an orientation transformation from S {123}〈634〉 texture with a low Schmid factor to Cube texture with a high Schimid factor, which enhances the activation of slip system and thus increases plasticity. Briefly, a significantly improvement of plasticity and formability of 5052 aluminum alloys can be attributed to the enhanced dynamic recrystallization and texture transformation during the electropulsing tensile process.

Key words： electropulsing tensile 5052 aluminum alloy texture dislocation deformation behavior dynamic recrystallization

Published: 24 December 2020

CLC number:

TG146.2

Fund:This work was financially supported by the National Natural Science Foundation of China (51874198), Shanghai Pujiang Program (17PJ1408600).

About author:: Xinyu Wang is currently studying for his M.E. degree in mechanical manufacture and automation at the Shanghai Institute of Technology. His research interests focus on material forming technology and forming equipment for aluminum and magnesium alloy, electric pulse assisted forming technology.
Chun Xu received her M.E. degree in pressure machining from the Chongqing University and Ph.D. degree in vehicle engineering from the Shanghai Jiao Tong University. She is currently a professor of the Shanghai Institute of Technology. She performed collaborative research in 2010—2011 in McCormick School of Engineering & Applied Science, USA Northwestern University. The paper published in collaboration with professor Jian Cao was awarded the BLACKALL MACHINE TOOL AND GAGEN AWARD for best paper by ASME in 2012. She has published many textbooks as chief editor. Her team′s research interests are warm forming technology and equipment development, special forming technology and equipment for light metal materials (magnesium alloy stamping and rolling), mechanism and technology of high strength metal forming, different metal brazing technology, evaluation of hydrogen storage performance and mechanism of metal materials and so on.
Yu Li received his B.E. degree and Ph.D. degree in materials science and engineering from the Shanghai Jiao Tong University in Sep. 2010—Sep. 2019. He is currently a lecturer of the Shanghai Institute of Techno-logy. He has published 12 journal papers and 4 of them were published on Acta. Mater. and Int. J. Plastic as the first author, applied 4 national invention patents and 3 of them were authorized. His research interests focus on the microstructure, mechanical properties and deformation mechanisms of metals materials with high strength-toughness, including high Mn steels, medium Mn steels, duplex stainless steels, super-alloys and high entropy alloys.

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Cite this article:

WANG Xinyu,XU Chun,LI Yu, et al. Deformation Behavior, Microstructure and Texture Evolution of 5052 Aluminum Alloy Under Electropulsing Tensile[J]. Materials Reports, 2020, 34(24): 24097-24103.

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http://www.mater-rep.com/EN/10.11896/cldb.19110004 OR http://www.mater-rep.com/EN/Y2020/V34/I24/24097

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