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Thermal stability of highly nanotwinned copper: The role of grain boundaries and texture

Published online by Cambridge University Press:  27 November 2012

Yifu Zhao
Affiliation:
Department of Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, California 90089
Timothy Allen Furnish
Affiliation:
Department of Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, California 90089
Michael Ernest Kassner
Affiliation:
Department of Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, California 90089
Andrea Maria Hodge*
Affiliation:
Department of Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, California 90089
*
a)Address all correspondence to this author. e-mail: ahodge@usc.edu
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Abstract

To study the effect of nanotwins on thermal stability, a comprehensive characterization study was performed on two types of ultrafine grained (UFG) copper samples, with and without nanotwins. The two samples were sequentially heat-treated at elevated temperatures, and the grain size, grain boundary character, and texture were characterized after each heat treatment. The as-prepared nanotwinned (nt) copper foil had an average columnar grain size of ∼700 nm with a high density of coherent twin boundaries (CTBs) (twin thickness, ∼40 nm), which remained stable up to 300 °C. In contrast, the other UFG sample had few CTBs, and rapid grain growth was observed at 200 °C. The thermal stability of nt copper is discussed with respect to the presence of the low energy nanotwins, triple junctions between the twins and columnar grains, texture and grain growth.

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Articles
Copyright
Copyright © Materials Research Society 2012

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References

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