@article{50fc5f77b1b74c6b85d39618a67d56d8,
title = "Bright x-rays reveal shifting deformation states and effects of the microstructure on the plastic deformation of crystalline materials",
abstract = "The plastic deformation of crystalline materials is usually modeled as smoothly progressing in space and time, yet modern studies show intermittency in the deformation dynamics of single-crystals arising from avalanche behavior of dislocation ensembles under uniform applied loads. However, once the prism of the microstructure in polycrystalline materials disperses and redistributes the load on a grain-by-grain basis, additional length and time scales are involved. Thus, the question is open as to how deformation intermittency manifests for the nonuniform grain-scale internal driving forces interacting with the finer-scale dislocation ensemble behavior. In this work we track the evolution of elastic strain within individual grains of a creep-loaded titanium alloy, revealing widely varying internal strains that fluctuate over time. The findings provide direct evidence of how flow intermittency proceeds for an aggregate of ∼700 grains while showing the influences of multiscale ensemble interactions and opening new avenues for advancing plasticity modeling.",
author = "Beaudoin, {A. J.} and Shade, {P. A.} and Schuren, {J. C.} and Turner, {T. J.} and C. Woodward and Bernier, {J. V.} and Li, {S. F.} and Dimiduk, {D. M.} and P. Kenesei and Park, {J. S.}",
note = "Funding Information: Discussions with Prof. K. Dahmen and Prof. R. Maass of the University of Illinois at Urbana-Champaign provided insight into interpretation of the results. The Ti-7Al material was provided by A. Pilchak of the U.S. Air Force Research Laboratory. The authors are grateful to B. Blank, A. Mashayekhi, and J. Almer for experimental support. Constructive criticism by reviewers improved the manuscript, and we also thank an anonymous reviewer who pointed out the connection between the present research and interpretations set forth by L.M. Brown. Support from the Materials and Manufacturing Directorate of the U.S. Air Force Research Laboratory is acknowledged. A.J.B. received support through Air Force contract FA8650-14-D-5205/0001. Use of the Advanced Photon Source, an Office of Science User Facility operated for the U.S. Department of Energy by Argonne National Laboratory, was supported under Contract No. DE-AC02-06CH11357. Publisher Copyright: {\textcopyright} 2017 American Physical Society.",
year = "2017",
month = nov,
day = "30",
doi = "10.1103/PhysRevB.96.174116",
language = "English (US)",
volume = "96",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "17",
}