Dislocation avalanches, strain bursts, and the problem of plastic forming at the micrometer scale

Csikor F, Motz C, Weygand D, Zaiser M, Zapperi S (2007)

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2007

Journal

Science American Association for the Advancement of Science

Publisher: AMER ASSOC ADVANCEMENT SCIENCE

Book Volume: 318

Pages Range: 251-254

Journal Issue: 5848

DOI: 10.1126/science.1143719

Abstract

Under stress, many crystalline materials exhibit irreversible plastic deformation caused by the motion of lattice dislocations. In plastically deformed microcrystals, internal dislocation avalanches lead to jumps in the stress-strain curves (strain bursts), whereas in macroscopic samples plasticity appears as a smooth process. By combining three-dimensional simulations of the dynamics of interacting dislocations with statistical analysis of the corresponding deformation behavior, we determined the distribution of strain changes during dislocation avalanches and established its dependence on microcrystal size. Our results suggest that for sample dimensions on the micrometer and submicrometer scale, large strain fluctuations may make it difficult to control the resulting shape in a plastic-forming process.

Authors with CRIS profile

Michael Zaiser Lehrstuhl für Werkstoffsimulation

Involved external institutions

Eötvös Loránd University / Eötvös Loránd Tudományegyetem (ELTE) HU Hungary (HU) Österreichische Akademie der Wissenschaften AT Austria (AT) Karlsruhe Institute of Technology (KIT) DE Germany (DE)

How to cite

APA:

Csikor, F., Motz, C., Weygand, D., Zaiser, M., & Zapperi, S. (2007). Dislocation avalanches, strain bursts, and the problem of plastic forming at the micrometer scale. Science, 318(5848), 251-254. https://dx.doi.org/10.1126/science.1143719

MLA:

Csikor, Ferenc, et al. "Dislocation avalanches, strain bursts, and the problem of plastic forming at the micrometer scale." Science 318.5848 (2007): 251-254.

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