In Situ Synchrotron X-ray Micro-Diffraction Investigation of Elastic Strains in Laminated Ti-Al Composites

Yu, Tianbo; Du, Yan; Fan, Guohua; Barabash, Rozaliya; Juul Jensen, Dorte; Zhang, Yubin

doi:10.3390/met11040668

In Situ Synchrotron X-ray Micro-Diffraction Investigation of Elastic Strains in Laminated Ti-Al Composites

Journal Article · Mon Apr 19 00:00:00 EDT 2021 · Metals

DOI:https://doi.org/10.3390/met11040668· OSTI ID:1778622

Yu, Tianbo; Du, Yan; Fan, Guohua; ; Juul Jensen, Dorte; Zhang, Yubin

Spatially resolved elastic strains in the bulk interior of a laminated Ti-Al metal composite were studied during in situ tensile loading at strains up to 1.66% by a synchrotron-based micro-diffraction technique, namely differential aperture X-ray microscopy (DAXM). For both Al and Ti grains, deviatoric elastic strains were estimated based on polychromatic X-ray microbeam diffraction, while lattice strains along the normal direction of the tensile sample were directly measured using monochromatic X-ray microbeam diffraction. The estimated deviatoric strains show large spatial variations, and the mean values are consistent with the external loading conditions, i.e., increasing tensile strain along the tensile direction and increasing compressive strain along the sample normal with increasing loading. The directly measured lattice strains also show large spatial variations, although the magnitude of this variation is smaller than that for the estimated deviatoric strain. The directly measured lattice strains in Ti grains are largely consistent with the external loading, whereas those in Al grains are in contradiction with the external loading. The causes of the experimental results are discussed and related to both the laminated microstructure of the composite material and the limitations of the techniques.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1778622

Alternate ID(s):: OSTI ID: 1824701
OSTI ID: 1784995

Journal Information:: Metals, Journal Name: Metals Journal Issue: 4 Vol. 11; ISSN MBSEC7; ISSN 2075-4701

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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