Spatial fluctuations of the microstructure suggest possible self-organized criticality in the Portevin-Le Chatelier plastic instability occurring in age-hardenable alloys. The discontinuous yielding found in a supersaturated Al alloy can be characterized by a universal power-law spectrum that is independent of the experimental conditions. The result provides an explanation for the formation of unexpected detrimental strain localizations when samples are severely deformed, giving a framework for studying the simultaneous effects of solute atoms and precipitates in the decomposition of solid solutions.
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This work was supported by the Hungarian Scientific Research Fund under Grant Nos. K81360, K67692, and TÁMOP 4.2.1/ B-09/1/KMR (N.Q.C., J.G., J.L.), and by the National Science Foundation of the United States under Grant No. DMR-0855009 and the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS (T.G.L.).
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Chinh, N.Q., Győri, T., Gubicza, J. et al. Possible self-organized criticality in the Portevin-Le Chatelier effect during decomposition of solid solution alloys. MRS Communications 2, 1–4 (2012). https://doi.org/10.1557/mrc.2011.25