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The microstructure length scale of strain rate sensitivity in ultrafine-grained aluminum

Published online by Cambridge University Press:  20 March 2015

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, UK
Samantha Daly*
Affiliation:
Department of Mechanical Engineering, The University of Michigan, Ann Arbor, Michigan 48109, USA; and Department of Materials Science & Engineering, The University of Michigan, Ann Arbor, Michigan 48109, USA
*
a)Address all correspondence to this author. e-mail: samdaly@umich.edu
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Abstract

The mechanical properties of ultrafine-grained aluminum produced by equal-channel angular pressing (ECAP) are strongly influenced by strain rate. In this work, an experimental investigation of local strain rate sensitivity as it relates to microstructure was performed using a combination of scanning electron microscopy and digital image correlation. Uniaxial tension tests were carried out at 200 °C and strain rates alternating between 2.5 × 10−5 s−1 and 3.0 × 10−3 s−1. The results demonstrate that the heterogeneous microstructure generated by ECAP has a strong effect on the microstructure scale strain rate sensitivity. Deformation centered at grain boundaries separating regions of banded microstructure exhibits the greatest strain rate sensitivity. Strain rate sensitivity is limited in deformation occurring in regions of microstructure composed of ultrafine grains separated by low-angle grain boundaries. The tensile specimens all failed by shear bands at 200 °C and at room temperature they failed by necking with little plastic deformation apparent outside of the neck.

Keywords

metalnanostructurescanning electron microscopy (SEM)

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Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 7 , 14 April 2015 , pp. 981 - 992
Copyright
Copyright © Materials Research Society 2015 

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