Effects of high Mg content and processing parameters on Portevin-Le Chatelier and negative strain rate sensitivity effects in Al–Mg alloys

Portevin-Le Chatelier (PLC) effect arises with increasing the Mg content in Al–Mg alloys. Due to the PLC effect, instability in plasticity and negative strain rate sensitivity (nSRS) are encountered during the metalworking process of the Al–Mg alloys, which reduce the ductility and formability of th...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2020-03, Vol.779, p.1-8, Article 139151
Main Authors: Cho, Chang-Hee, Son, Hyeon-Woo, Lee, Jae-Cheol, Son, Kwang-Tae, Lee, Ji-Woon, Hyun, Soong-Keun
Format: Article
Language:English
Subjects:
Al-Mg alloys
Aluminum base alloys
Deformation effects
Ductility tests
Dynamic strain aging
Metal working
Negative strain rate sensitivity
Parameter sensitivity
Portevin-le Chatelier effect
Precipitation hardening
Process parameters
Serrated yielding
Stacking fault energy
Strain rate sensitivity
Torsion tests
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Summary:Portevin-Le Chatelier (PLC) effect arises with increasing the Mg content in Al–Mg alloys. Due to the PLC effect, instability in plasticity and negative strain rate sensitivity (nSRS) are encountered during the metalworking process of the Al–Mg alloys, which reduce the ductility and formability of the materials. Herein, torsion tests are performed on the Al–Mg alloys with high Mg content to determine the effect of Mg content and processing parameters on the PLC and nSRS effects. Analyses of the flow curves and deformed microstructures reveal that the Mg content and processing parameters affect the dynamic strain aging and PLC effects in Al–Mg alloys. In some combinations of Mg content, temperature, and strain rate, the PLC effect is weakened and nSRS is not observed because the appropriate selection of Mg content and temperature can lower the stacking fault energy of Al–Mg alloy.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2020.139151