Nucleation and growth of deformation twins in nanocrystalline aluminum Academic 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.

authors

• Lavernia Borrego, Enrique

published proceedings

• Applied Physics Letters

author list (cited authors)

• Zhu, Y. T., Liao, X. Z., Srinivasan, S. G., Zhao, Y. H., Baskes, M. I., Zhou, F., & Lavernia, E. J.

complete list of authors

• Zhu, YT||Liao, XZ||Srinivasan, SG||Zhao, YH||Baskes, MI||Zhou, F||Lavernia, EJ

publication date

• November 2004

publisher

• AIP Publishing  Publisher

published in

• Applied Physics Letters  Journal

keywords

• 40 Engineering
• 4016 Materials Engineering

Digital Object Identifier (DOI)

• 10.1063/1.1823042

start page

• 5049

end page

• 5051

volume

• 85

issue

• 21

URL

• http://dx.doi.org/10.1063/1.1823042