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Yield precursor dislocation avalanches in small crystals: the irreversibility transition

Ni, Xiaoyue and Zhang, Haolu and Liarte, Danilo B. and McFaul, Louis W. and Dahmen, Karin A. and Sethna, James P. and Greer, Julia R. (2019) Yield precursor dislocation avalanches in small crystals: the irreversibility transition. Physical Review Letters, 123 (3). Art. No. 035501. ISSN 0031-9007. doi:10.1103/PhysRevLett.123.035501.

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The transition from elastic to plastic deformation in crystalline metals shares history dependence and scale-invariant avalanche signature with other nonequilibrium systems under external loading such as colloidal suspensions. These other systems exhibit transitions with clear analogies to work hardening and yield stress, with many typically undergoing purely elastic behavior only after “training” through repeated cyclic loading; studies in these other systems show a power-law scaling of the hysteresis loop extent and of the training time as the peak load approaches a so-called reversible-to-irreversible transition (RIT). We discover here that deformation of small crystals shares these key characteristics: yielding and hysteresis in uniaxial compression experiments of single-crystalline Cu nano- and micropillars decay under repeated cyclic loading. The amplitude and decay time of the yield precursor avalanches diverge as the peak stress approaches failure stress for each pillar, with a power-law scaling virtually equivalent to RITs in other nonequilibrium systems.

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Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2019 American Physical Society. Received 29 November 2018; revised manuscript received 5 June 2019; published 15 July 2019. J. R. G. and X. N. acknowledge financial support from the U.S. Department of Energy’s Office of Basic Energy Sciences through Grant No. DESC0016945. J. P. S. and D. B. L. acknowledge the financial support of the U.S. Department of Energy’s Office of Basic Energy Sciences through Grant No. DE-FG02-07ER46393 and NSF Grant No. DMR-1719490. K. A. D. acknowledges NSF Grant No. CBET 1336634. We thank Stefano Zapperi, Giulio Costantini, D. Zeb Rocklin, Archishman Raju, and Lorien Hayden for helpful discussions.
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Department of Energy (DOE)DE-SC0016945
Department of Energy (DOE)DE-FG02-07ER46393
Issue or Number:3
Record Number:CaltechAUTHORS:20180910-144259345
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89507
Deposited By: Tony Diaz
Deposited On:10 Sep 2018 22:28
Last Modified:16 Nov 2021 00:35

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