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Title: Intermittent plasticity in individual grains: A study using high energy x-ray diffraction

Abstract

Long-standing evidence suggests that plasticity in metals may proceed in an intermittent fashion. While the documentation of intermittency in plastically deforming materials has been achieved in several experimental settings, efforts to draw connections from dislocation motion and structure development to stress relaxation have been limited, especially in the bulk of deforming polycrystals. This work uses high energy x-ray diffraction measurements to build these links by characterizing plastic deformation events inside individual deforming grains in both the titanium alloy, Ti-7Al, and the magnesium alloy, AZ31. This analysis is performed by combining macroscopic stress relaxation data, complete grain stress states found using far-field high energy diffraction microscopy, and rapid x-ray diffraction spot measurements made using a Mixed-Mode Pixel Array Detector. Changes in the dislocation content within the deforming grains are monitored using the evolution of the full 3-D shapes of the diffraction spot intensity distributions in reciprocal space. The results for the Ti-7Al alloy show the presence of large stress fluctuations in contrast to AZ31, which shows a lesser degree of intermittent plastic flow.

Authors:
 [1];  [2];  [3];  [4];  [3];  [3]; ORCiD logo [3];  [5];  [5]
  1. Univ. of Illinois, Urbana-Champaign, IL (United States)
  2. Univ. of Illinois, Urbana-Champaign, IL (United States); Cornell Univ., Ithaca, NY (United States)
  3. Cornell Univ., Ithaca, NY (United States)
  4. Air Force Research Lab, Wright-Patterson Air Force Base, OH (United States)
  5. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Air Force Research Laboratory (AFRL), Air Force Office of Scientific Research (AFOSR); Air Force Research Laboratory (AFRL), Materials and Manufacturing Directorate; Cornell High Energy Synchrotron Source (CHESS); National Science Foundation (NSF)
OSTI Identifier:
1526480
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Structural Dynamics
Additional Journal Information:
Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2329-7778
Publisher:
American Crystallographic Association/AIP
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; diffraction; metal plasticity

Citation Formats

Chatterjee, K., Beaudoin, A. J., Pagan, D. C., Shade, P. A., Philipp, H. T., Tate, M. W., Gruner, S. M., Kenesei, P., and Park, J. -S. Intermittent plasticity in individual grains: A study using high energy x-ray diffraction. United States: N. p., 2019. Web. doi:10.1063/1.5068756.
Chatterjee, K., Beaudoin, A. J., Pagan, D. C., Shade, P. A., Philipp, H. T., Tate, M. W., Gruner, S. M., Kenesei, P., & Park, J. -S. Intermittent plasticity in individual grains: A study using high energy x-ray diffraction. United States. doi:10.1063/1.5068756.
Chatterjee, K., Beaudoin, A. J., Pagan, D. C., Shade, P. A., Philipp, H. T., Tate, M. W., Gruner, S. M., Kenesei, P., and Park, J. -S. Mon . "Intermittent plasticity in individual grains: A study using high energy x-ray diffraction". United States. doi:10.1063/1.5068756. https://www.osti.gov/servlets/purl/1526480.
@article{osti_1526480,
title = {Intermittent plasticity in individual grains: A study using high energy x-ray diffraction},
author = {Chatterjee, K. and Beaudoin, A. J. and Pagan, D. C. and Shade, P. A. and Philipp, H. T. and Tate, M. W. and Gruner, S. M. and Kenesei, P. and Park, J. -S.},
abstractNote = {Long-standing evidence suggests that plasticity in metals may proceed in an intermittent fashion. While the documentation of intermittency in plastically deforming materials has been achieved in several experimental settings, efforts to draw connections from dislocation motion and structure development to stress relaxation have been limited, especially in the bulk of deforming polycrystals. This work uses high energy x-ray diffraction measurements to build these links by characterizing plastic deformation events inside individual deforming grains in both the titanium alloy, Ti-7Al, and the magnesium alloy, AZ31. This analysis is performed by combining macroscopic stress relaxation data, complete grain stress states found using far-field high energy diffraction microscopy, and rapid x-ray diffraction spot measurements made using a Mixed-Mode Pixel Array Detector. Changes in the dislocation content within the deforming grains are monitored using the evolution of the full 3-D shapes of the diffraction spot intensity distributions in reciprocal space. The results for the Ti-7Al alloy show the presence of large stress fluctuations in contrast to AZ31, which shows a lesser degree of intermittent plastic flow.},
doi = {10.1063/1.5068756},
journal = {Structural Dynamics},
issn = {2329-7778},
number = 1,
volume = 6,
place = {United States},
year = {2019},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 2 works
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Figures / Tables:

TABLE I TABLE I: Basal and prismatic resolved shear stresses (RSS) (absolute values) for grains $‘S'$ and $‘I'$

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