Dislocation density evolution during high pressure torsion of a nanocrystalline NiFe alloy Academic Article

abstract

• High-pressure torsion (HPT) induced dislocation density evolution in a nanocrystalline Ni-20wt%Fe alloy was investigated using x-ray diffraction and transmission electron microscopy. Results suggest that the dislocation density evolution is fundamentally different from that in coarse-grained materials. The HPT process initially reduces the dislocation density within nanocrystalline grains and produces a large number of dislocations located at small-angle subgrain boundaries that are formed via grain rotation and coalescence. Continuing the deformation process eliminates the subgrain boundaries but significantly increases the dislocation density in grains. This phenomenon provides an explanation of the mechanical behavior of some nanostructured materials.

authors

• Lavernia Borrego, Enrique

published proceedings

• Applied Physics Letters

author list (cited authors)

• Wang, Y. B., Ho, J. C., Cao, Y., Liao, X. Z., Li, H. Q., Zhao, Y. H., ... Zhu, Y. T.

complete list of authors

• Wang, YB||Ho, JC||Cao, Y||Liao, XZ||Li, HQ||Zhao, YH||Lavernia, EJ||Ringer, SP||Zhu, YT

publication date

• March 2009

publisher

• AIP Publishing  Publisher

published in

• Applied Physics Letters  Journal

keywords

• 40 Engineering
• 4016 Materials Engineering

Digital Object Identifier (DOI)

• 10.1063/1.3095852

start page

• 091911

volume

• 94

issue

• 9

URL

• http://dx.doi.org/10.1063/1.3095852