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Proceedings Paper

Strengthening and softening mechanisms in nanocrystalline materials exhibiting superplasticity
Author(s): Mikhail Yu. Gutkin; Ilya A. Ovid'ko; Nikolai V. Skiba
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Paper Abstract

A review of theoretical models describing the strengthening and softening mechanisms in nanocrystalline materials under superplastic deformation is given. In the framework of these models, the strengthening occurs due to the effects of triple junctions of grain boundaries as obstacles for grain boundary sliding. The local migration of triple interface junctions (caused by grain boundary sliding) and the emission of lattice dislocations bring about softening of a nanocrystalline material. The flow stress is found as a function of the total plastic strain, and the results agree well with experimental data from nanocrystalline materials exhibiting superplasticity, reported in the literature.

Paper Details

Date Published: 9 June 2006
PDF: 9 pages
Proc. SPIE 6253, Ninth International Workshop on Nondestructive Testing and Computer Simulations, 62530J (9 June 2006); doi: 10.1117/12.676717
Show Author Affiliations
Mikhail Yu. Gutkin, Institute of Problems of Mechanical Engineering (Russia)
Ilya A. Ovid'ko, Institute of Problems of Mechanical Engineering (Russia)
Nikolai V. Skiba, Institute of Problems of Mechanical Engineering (Russia)


Published in SPIE Proceedings Vol. 6253:
Ninth International Workshop on Nondestructive Testing and Computer Simulations
Alexander I. Melker, Editor(s)

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