Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/35687
Title: Quantitative damage and detwinning analysis of nanotwinned copper foil under cyclic loading
Authors: Yoo, BG
Boles, ST 
Liu, Y
Zhang, X
Schwaiger, R
Eberl, C
Kraft, O
Keywords: Fatigue
High-throughput test
Nanotwinned metal
Detwinning
Copper
Issue Date: 2014
Publisher: Pergamon Press
Source: Acta materialia, 2014, v. 81, p. 184-193 How to cite?
Journal: Acta materialia 
Abstract: High-purity Cu samples containing parallel columns of highly aligned nanotwins with median spacing of similar to 25 nm were subjected to tension-compression cyclic loading by a high-throughput cyclic testing method. The methodology utilizes gradients in surface strain amplitude of a vibrating cantilever: one along the beam axis, with decreasing strain from the fixed to the free end of the beam, and the other through the foil thickness with decreasing strain from the surface to the neutral axis. Systematic microstructural investigations indicate that nanotwins are not stable under cyclic loading and that the applied strain amplitude has a strong influence on the resulting twin structure. In the highly stressed regions the detwinning process produces a twin free microstructure, allowing for subsequent extrusion and crack formation, and introduces fatal defects into structural parts.
URI: http://hdl.handle.net/10397/35687
ISSN: 1359-6454
DOI: 10.1016/j.actamat.2014.08.021
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