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The effect of microstructure heterogeneity on the microscale deformation of ultrafine-grained aluminum

Published online by Cambridge University Press:  12 August 2014

Adam D. Kammers Open the ORCID record for Adam D. Kammers [Opens in a new window] ,
Jittraporn Wongsa-Ngam ,
Terence G. Langdon  and
Samantha Daly
Adam D. Kammers
Affiliation:
Department of Mechanical Engineering, The University of Michigan, Ann Arbor, Michigan 48109, USA
Jittraporn Wongsa-Ngam
Affiliation:
Department of Mechanical Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand
Terence G. Langdon
Affiliation:
Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-1453, USA; and Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, United Kingdom
Samantha Daly*
Affiliation:
Department of Materials Science & Engineering, The University of Michigan, Ann Arbor, Michigan 48109, USA; and Department of Mechanical Engineering, The University of Michigan, Ann Arbor, Michigan 48109, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A combined approach of scanning electron microscopy and digital image correlation was used to examine microstructure-scale strain localization and active deformation mechanisms in ultrafine-grained (UFG) high purity (99.99%) aluminum processed by equal-channel angular pressing (ECAP). The results from tensile tests demonstrate a strong relationship between the heterogeneous microstructure and strain localization. The localized deformation was investigated in areas that contain significantly different microstructural features typical of ECAP processed aluminum. It was found that areas of the UFG microstructure containing primarily low angle grain boundaries deformed by dislocation slip and behaved similarly to a coarse-grained material. The greatest strain localization occurred at high angle grain boundaries (HAGBs) separating distinct microstructure regions and with median surface trace angles of approximately 26.6°. In areas of banded microstructure, shear strain localization as high as 30% and shear displacements of up to 500 nm occurred at the HAGBs separating bands, suggesting grain boundary sliding.

Keywords

metalnanostructurescanning electron microscopy (SEM)
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 15 , 14 August 2014 , pp. 1664 - 1674
Copyright
Copyright © Materials Research Society 2014 

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