Paper Title:

Microstructural Stability and Creep in Nanocrystals

Periodical Materials Science Forum (Volumes 584 - 586)
Main Theme Nanomaterials by Severe Plastic Deformation IV
Edited by Yuri Estrin and Hans Jürgen Maier
Pages 876-883
DOI 10.4028/
Citation Atul H. Chokshi, 2008, Materials Science Forum, 584-586, 876
Online since June 2008
Authors Atul H. Chokshi
Keywords Creep, Diffusion, Dislocation, Grain Growth, Nanocrystal
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Microstructural stability is an important consideration during high temperature deformation and processing of nanomaterials. We will address issues relating to triple junctions in limiting grain growth during creep as well as densification. Although early studies on deformation have considered diffusion creep as a possible rate controlling deformation mechanism in nanocrystals, a critical inspection of available data indicates that there is no strong evidence for conventional diffusion creep in such materials. The possibility of diffusion creep by rapid diffusion along triple junctions will be analyzed, and interface controlled diffusion creep will also be discussed critically. It is shown that the critical grain size for dislocation activity is similar to that for occurrence of conventional diffusion creep.