Strengthening and softening mechanisms in nanocrystalline materials exhibiting superplasticity

Mikhail Yu. Gutkin; Ilya A. Ovid'ko; Nikolai V. Skiba

doi:10.1117/12.676717

9 June 2006 Strengthening and softening mechanisms in nanocrystalline materials exhibiting superplasticity

Mikhail Yu. Gutkin, Ilya A. Ovid'ko, Nikolai V. Skiba

Proceedings Volume 6253, Ninth International Workshop on Nondestructive Testing and Computer Simulations; 62530J (2006) https://doi.org/10.1117/12.676717
Event: Ninth International Workshop on Nondestructive Testing and Computer Simulations, 2005, St. Petersburg, Russian Federation

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.

Citation Download Citation

Mikhail Yu. Gutkin, Ilya A. Ovid'ko, and Nikolai V. Skiba "Strengthening and softening mechanisms in nanocrystalline materials exhibiting superplasticity", Proc. SPIE 6253, Ninth International Workshop on Nondestructive Testing and Computer Simulations, 62530J (9 June 2006); https://doi.org/10.1117/12.676717

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