Please use this identifier to cite or link to this item: https://elar.rsvpu.ru/handle/123456789/39915
Title: Deformation-induced effect of phase instability of nanocrystalline alloys
Authors: Yermakov, A. Ye.
Gapontzev, V. L.
Kondratyev, V. V.
Gornostyrev, Yu. N.
Issue Date: 1999
Publisher: Trans Tech Publ, Uetikon-Zuerich
Abstract: A theoretical treatment of the fundamental phenomenon of phase instability of nanocrystalline alloys under intensive plastic deformation are performed. It is shown within the framework of a diffusion model that decomposition of nanocrystalline alloys is related to the existence of powerful sources of nonequilibrium vacancies that acting during deformation. Irreversibility of decomposition is defined by conservation a uni-directional vacancies flux between, for instance, triple junctions of grains in nanocrystals. The effect is observed when certain relationships are fulfilled between the characteristic times of vacancy flux existence, the homogenizing time and the time of life of a stable nanocrystalline structure. The evolution of substructure in the course of deformation may change the nature of transformation: back from decomposition to formation of a solid solution.
Keywords: CRYSTAL STRUCTURE
DECOMPOSITION
DIFFUSION IN SOLIDS
NANOSTRUCTURED MATERIALS
PHASE TRANSITIONS
PLASTIC DEFORMATION
SOLID SOLUTIONS
NANOCRYSTALLINE ALLOYS
NANOCRYSTALS
NONEQUILIBRIUM VACANCIES
PHASE INSTABILITY
UNIDIRECTIONAL VACANCIES FLUX
ALLOYS
Conference name: Proceedings of the 1998 International Symposium on Metastable, Mechanical Alloyed and Nanocrystalline Materials, ISMANAM-98
Conference date: 7 December 1998 through 12 December 1998
ISSN: 2555476
DOI: 10.4028/www.scientific.net/msf.312-314.265
metadata.local.identifier.scopus: 0032688443
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS

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