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Quantitative Measurements of Grain Boundary Sliding in an Ultrafine-Grained Al Alloy by Atomic Force Microscopy

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Abstract

In the current study, quantitative measurements for grain boundary sliding (GBS) in ultrafine-grained (UFG) 5083 Al by atomic force microscopy (AFM) were performed. An ion beam polishing and etching technique was used to reveal grain boundaries in the alloy for AFM characterization. A comparison between the average grain sizes measured from AFM images and those estimated from transmission electron microscopy micrographs and electron backscatter diffraction (EBSD) maps showed excellent agreement. The vertical offset of GBS was measured by comparing predeformation and postdeformation AFM images. By analyzing these measurements, the contribution of GBS to the total tensile strain in 5083 Al was estimated as 25 pct at a strain rate of 10−4 seconds−1 and a temperature of 473 K (200 °C). It was demonstrated that the relatively low value of the contribution of GBS to the total strain is most likely the result of testing UFG 5083 Al under experimental conditions that favor the dominance of region I (low-stress region) of the sigmoidal behavior characterizing high-strain-rate superplasticity, which was reported previously for the alloy.

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Acknowledgments

This work was supported by Grant DMR-0702978 from the National Science foundation. The authors wish to acknowledge the assistance given by Dr. David Witkin in preparing the material. Also, thanks are due to graduate student Shehreen Dheda for useful suggestions, to South Bay Technology for using characterization facilities, and to LEXI in Calit2 at the University of California, Irvine.

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Authors and Affiliations

  1. Department of Chemical Engineering and Materials Science, University of California—Irvine, Irvine, CA, 92697-2575, USA

    Jung H. Han (Graduate Research Assistant) & Farghalli A. Mohamed (Professor)

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  1. Jung H. Han
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  2. Farghalli A. Mohamed
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Correspondence to Farghalli A. Mohamed.

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Manuscript submitted December 7, 2010.

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Han, J.H., Mohamed, F.A. Quantitative Measurements of Grain Boundary Sliding in an Ultrafine-Grained Al Alloy by Atomic Force Microscopy. Metall Mater Trans A 42, 3969–3978 (2011). https://doi.org/10.1007/s11661-011-0871-0

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