Elemental redistribution in a nanocrystalline Ni–Fe alloy induced by high-pressure torsion

Ni, S., Sha, G., Wang, Y.B., Liao, X.Z., Alhajeri, S.N., Li, H.Q., Zhu, Y.T., Langdon, T.G. and Ringer, S.P. (2011) Elemental redistribution in a nanocrystalline Ni–Fe alloy induced by high-pressure torsion. Materials Science and Engineering: A, 528 (25-26), 7500-7505. (doi:10.1016/j.msea.2011.06.057).

Abstract

An electrochemically deposited nanocrystalline supersaturated face-centred-cubic Ni–21 at.% Fe alloy with an initial average grain size of ?21 nm was processed using high-pressure torsion (HPT) that resulted in grain growth via grain rotation and coalescence to an average grain size of ?53 nm. Atom probe tomography investigations revealed that the supersaturated Ni–Fe solid solution was stable under HPT and that C and S atoms, which are the major impurities in the material and segregated to the grain boundaries (GBs) of the as-deposited material, migrated from disappearing GBs to the remaining GBs during HPT. We propose that the elemental redistribution was facilitated by GB diffusion and the motion of a large volume of HPT-induced defects at the GB regions during the grain growth process. This elemental redistribution process is different from other HPT-induced elemental redistribution processes reported in the literature

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Contributors

Author: T.G. Langdon

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