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Title: Dislocation density in fine grain-size spark-plasma sintered aluminum measured using high brightness synchrotron radiation

Abstract

In this study, three-dimensional orientation mapping of samples of aluminum prepared by spark plasma sintering (SPS) with average grain sizes of 5 μm and 1 μm has been carried out using high-brightness synchrotron radiation, from which the geometrically necessary dislocation (GND) density has been determined. The low average measured GND density values confirm that the SPS process can be used to produce samples containing grains with dislocation density similar to that of fully recrystallized coarse-grained samples. Values of GND density are also compared to those obtained from electron back-scatter diffraction studies on the same material, highlighting the significantly higher angular resolution of the synchrotron data. For the 5 μm grain-size sample the measured GND density can account for a large fraction of the previously observed positive Hall-Petch deviation of this material. For the 1 μm grain-size sample, however, the GND-based strengthening contribution is much smaller than the reported positive Hall-Petch deviation, such that the additional strength may be reliably associated with dislocation source-limited strengthening.

Authors:
 [1];  [1];  [2]; ORCiD logo [3];  [4];  [4];  [2]
  1. Tsinghua Univ., Beijing (China)
  2. Technical Univ. of Denmark, Lyngby (Denmark)
  3. Chongqing Univ. (China)
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); European Research Council (ERC)
OSTI Identifier:
1774419
Grant/Contract Number:  
AC02-06CH11357; 51471095; 51671113; 788567
Resource Type:
Accepted Manuscript
Journal Name:
Materials Letters
Additional Journal Information:
Journal Volume: 269; Journal ID: ISSN 0167-577X
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; x-ray techniques; metals and alloys; synchrotron radiation; spark plasma sintering; geometrically necessary dislocations

Citation Formats

Zhang, C. L., Godfrey, A., Zhang, Y., Wu, G. L., Xu, R., Liu, W., and Juul Jensen, D. Dislocation density in fine grain-size spark-plasma sintered aluminum measured using high brightness synchrotron radiation. United States: N. p., 2020. Web. doi:10.1016/j.matlet.2020.127653.
Zhang, C. L., Godfrey, A., Zhang, Y., Wu, G. L., Xu, R., Liu, W., & Juul Jensen, D. Dislocation density in fine grain-size spark-plasma sintered aluminum measured using high brightness synchrotron radiation. United States. https://doi.org/10.1016/j.matlet.2020.127653
Zhang, C. L., Godfrey, A., Zhang, Y., Wu, G. L., Xu, R., Liu, W., and Juul Jensen, D. Thu . "Dislocation density in fine grain-size spark-plasma sintered aluminum measured using high brightness synchrotron radiation". United States. https://doi.org/10.1016/j.matlet.2020.127653. https://www.osti.gov/servlets/purl/1774419.
@article{osti_1774419,
title = {Dislocation density in fine grain-size spark-plasma sintered aluminum measured using high brightness synchrotron radiation},
author = {Zhang, C. L. and Godfrey, A. and Zhang, Y. and Wu, G. L. and Xu, R. and Liu, W. and Juul Jensen, D.},
abstractNote = {In this study, three-dimensional orientation mapping of samples of aluminum prepared by spark plasma sintering (SPS) with average grain sizes of 5 μm and 1 μm has been carried out using high-brightness synchrotron radiation, from which the geometrically necessary dislocation (GND) density has been determined. The low average measured GND density values confirm that the SPS process can be used to produce samples containing grains with dislocation density similar to that of fully recrystallized coarse-grained samples. Values of GND density are also compared to those obtained from electron back-scatter diffraction studies on the same material, highlighting the significantly higher angular resolution of the synchrotron data. For the 5 μm grain-size sample the measured GND density can account for a large fraction of the previously observed positive Hall-Petch deviation of this material. For the 1 μm grain-size sample, however, the GND-based strengthening contribution is much smaller than the reported positive Hall-Petch deviation, such that the additional strength may be reliably associated with dislocation source-limited strengthening.},
doi = {10.1016/j.matlet.2020.127653},
journal = {Materials Letters},
number = ,
volume = 269,
place = {United States},
year = {Thu Mar 12 00:00:00 EDT 2020},
month = {Thu Mar 12 00:00:00 EDT 2020}
}

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