Abstract
Tensile tests were carried out by deforming polycrystalline samples of Al-2.5 pct Mg alloy at four different temperatures in an intermediate strain rate regime of 2 × 10−4 s−1 to 2 × 10−3 s−1. The Portevin-Le Chatelier (PLC) effect was observed throughout the strain rate and temperature region. The mean cumulative stress drop magnitude and the mean reloading time exhibit an increasing trend with temperature, which is attributed to the enhanced solute diffusion at higher temperature. The observed stress–time series data were analyzed using the nonlinear dynamical methods. From the analyses, we established the presence of deterministic chaos in the PLC effect throughout the temperature regime. The dynamics goes to higher dimension at a sufficiently high temperature of 425 K (152 °C), but the complexity of the dynamics is not affected by the temperature.
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Acknowledgments
The experimental work described in this article was performed in the Nuclear Materials Laboratory at the North Carolina State University, and we acknowledge the support of the National Science Foundation Grant DMR0412583. The assistance of Mr. Usama Elkazaz in carrying out the experiments is acknowledged.
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Manuscript submitted January 27, 2010.
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Chatterjee, A., Murty, K.L., Gayathri, N. et al. Temperature Dependence of the Dynamics of Portevin-Le Chatelier Effect in Al-2.5 Pct Mg Alloy. Metall Mater Trans A 42, 1184–1190 (2011). https://doi.org/10.1007/s11661-010-0530-x
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DOI: https://doi.org/10.1007/s11661-010-0530-x