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The character of dislocation structure evolution in nanocrystalline FCC Ni-Co alloys prepared by high-energy mechanical milling

Lookup NU author(s): Dr Alexander Korsunsky

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Abstract

The process of dislocation structure evolution and nanocrystalline structure formation during high-energy mechanical milling (MM) was studied in Ni-Co alloys with different stacking fault energy (SFE). X-ray patterns were analysed to determine the lattice microstrain, average crystallite size, probability of the stacking faults and the lattice parameter. Comparison with some other methods of inducing plastic deformation (open-die forging and filing), as well as the analysis of temporal changes in the structural parameters during MM, allowed us to elucidate the sequence of events leading to the formation of a nanocrystalline structure. It was found that SFE is the key factor controlling the process of dynamic recovery. It significantly influences the kinetics of the nanocrystalline structure formation, as well as the steady state structural parameters observed at very long milling times. An anomalous dependence of the lattice microstrain on SFE was also observed. This effect is discussed using a model of the nanocrystalline state composed of dislocation pile-ups separated by high-angle boundaries.

Publication metadata

Author(s): Salimon AI, Korsunsky AM, Ivanov AN

Publication type: Article

Publication status: Published

Journal: Materials Science and Engineering A

Year: 1999

Volume: 271

Issue: 1-2

Pages: 196-205

Print publication date: 01/11/1999

ISSN (print): 0921-5093

ISSN (electronic): 1873-4928

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/S0921-5093(99)00205-1

DOI: 10.1016/S0921-5093(99)00205-1

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