Phys. Rev. Lett. 85, 4096–4099 (2000)Critical Dynamics of Burst Instabilities in the Portevin-Le Châtelier EffectReceived 5 June 2000; published in the issue dated 6 November 2000 We investigate the Portevin-Le Châtelier effect (PLC), by compressing Al-Mg alloys in a very large deformation range, and interpret the results from the viewpoint of phase transitions and critical phenomena. The system undergoes two dynamical phase transitions between intermittent (or “jerky”) and “laminar” plastic dynamic phases. Near these two dynamic critical points, the order parameter 1/τ of the PLC effect exhibits large fluctuations, and “critical slowing down” (i.e., the number τ of bursts, or plastic instabilities, per unit time slows down considerably). © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.4096
DOI:
10.1103/PhysRevLett.85.4096
PACS:
62.20.Fe, 81.40.Lm, 83.50.-v
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