TITLE

Nucleation and growth of deformation twins in nanocrystalline aluminum

AUTHOR(S)
Zhu, Y. T.; Liao, X. Z.; Srinivasan, S. G.; Zhao, Y. H.; Baskes, M. I.; Zhou, F.; Lavernia, E. J.
PUB. DATE
November 2004
SOURCE
Applied Physics Letters;11/22/2004, Vol. 85 Issue 21, p5049
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Deformation twins (DTs) in nanocrystalline (nc) Al were both predicted by atomic simulations, and observed experimentally. However, despite encouraging preliminary results, their formation mechanism remains poorly understood. Here we present an analytical model, based on classical dislocation theory, to explain the nucleation and growth of DTs in nc Al. A 60° dislocation system consisting of a 90° leading partial and a 30° trailing partial is found to most readily nucleate and grow a DT. The model suggests that the stress for twin growth is much smaller than that for its nucleation. It also predicts an optimal grain size for twin nucleation. The model successfully explains DTs observed experimentally in nc Al and is also applicable to other nc metals.
ACCESSION #
15155524

 

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