Emission Nuclear Gamma-Resonance Spectroscopy of Grain Boundaries in Coarse-Grained and Ultrafine-Grained Polycrystalline Mo

Abstract:

Grain boundaries in coarse-grained Mo with grain boundaries of recrystallization origin and in ultrafine-grained (UFG) Mo obtained by high pressure torsion have been studied by the emission Mössbauer spectroscopy on the ⁵⁷Co (⁵⁷Fe) nuclei. It is demonstrated that Co atoms diffuse along grain boundaries by interstitials. The temperature dependence of grain-boundary segregation factor of Co in coarse-grained Mo has been determined. It is shown that the state of Co atoms in grain boundaries and near-boundary areas in UFG Mo differs from that in coarse-grained Mo.

• Periodical: Defect and Diffusion Forum (Volume 364)
• Pages: 147-156
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.364.147
• Online since: June 2015
• Authors: Vladimir V. Popov, A.V. Sergeev, Alexey V. Stolbovsky
• Keywords: Grain Boundaries, Mössbauer Spectroscopy, Severe Plastic Deformation

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