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Effect of alloying elements and processing parameters on the Portevin-Le Chatelier effect of Al-Mg alloys

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Abstract

The effects of alloying elements and processing parameters on the mechanical properties and Portevin-Le Chatelier effect of Al-Mg alloys developed for inner auto body sheets were investigated in detail. Tensile testing was performed in various Zn and Mg contents under different annealing and cold-rolling conditions. In the results, the stress drop and reloading time of serrations increase with increasing plastic strain and exhibit a common linear relationship. The increase rates of stress drop and reloading time increase with increasing Mg or Zn content. The alloys with a greater intensity of serrated yielding generally exhibit a greater elongation. The stress drop and reloading time of serrations decrease with increasing grain size in the case of the annealed samples. The cold-rolled sample exhibits the most severe serration because it initially contains a large number of grain boundaries and dislocations.

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Authors and Affiliations

  1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China

    Peng-cheng Ma, Di Zhang, Lin-zhong Zhuang & Ji-shan Zhang

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  1. Peng-cheng Ma
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  2. Di Zhang
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Correspondence to Di Zhang.

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Ma, Pc., Zhang, D., Zhuang, Lz. et al. Effect of alloying elements and processing parameters on the Portevin-Le Chatelier effect of Al-Mg alloys. Int J Miner Metall Mater 22, 175–183 (2015). https://doi.org/10.1007/s12613-015-1058-2

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  • DOI: https://doi.org/10.1007/s12613-015-1058-2

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