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

Zhang, C. L.; Godfrey, A.; Zhang, Y.; Wu, G. L.; Xu, R.; Liu, W.; Juul Jensen, D.

doi:10.1016/j.matlet.2020.127653

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

Journal Article · Thu Mar 12 00:00:00 EDT 2020 · Materials Letters

DOI:https://doi.org/10.1016/j.matlet.2020.127653· OSTI ID:1774419

Zhang, C. L. ^[1]; Godfrey, A. ^[1]; Zhang, Y. ^[2];

^[3]; Xu, R. ^[4]; Liu, W. ^[4]; Juul Jensen, D. ^[2]

Tsinghua Univ., Beijing (China)
Technical Univ. of Denmark, Lyngby (Denmark)
Chongqing Univ. (China)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

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.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); European Research Council (ERC)

Grant/Contract Number:: AC02-06CH11357; 51471095; 51671113; 788567

OSTI ID:: 1774419

Journal Information:: Materials Letters, Vol. 269; ISSN 0167-577X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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