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On the applicability of the x-ray diffraction line profile analysis in extracting grain size and microstrain in nanocrystalline materials

  • H. G. Jiang (a1), M. Rühle (a2) and E. J. Lavernia (a1)

Abstract

Measurements of x-ray diffraction (XRD) profiles have been performed on commercially pure Fe and Al powders, cryomilled Fe–3 wt.% Al powders, cold pressed (CP) pure Fe and Al, hot pressed (HP) and hot isostatically pressed (HIP) Fe–3 wt.% Al. Scherrer equation (SE), integral breadth analysis (IBA), and single-line approximation (SLA) methods have been employed to extract grain size and microstrain. The results demonstrate that, in the case of the cryomilled nanocrystalline Fe–3 wt.% Al powders, all these XRD techniques yielded reasonable, consistent grain size results. However, discrepancies were found in cold pressed (CP-Fe), hot pressed (HP-Fe–3 wt.% Al), and hot isostatically pressed (HIP-Fe–3 wt.% Al) samples. TEM imaging revealed the presence of a certain density of dislocations inside the grains in the HP-Fe–3 wt.% Al and HIP-Fe–3 wt.% Al, which is thought to be partly or fully responsible for the observed discrepancies.

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On the applicability of the x-ray diffraction line profile analysis in extracting grain size and microstrain in nanocrystalline materials

  • H. G. Jiang (a1), M. Rühle (a2) and E. J. Lavernia (a1)

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