Anomalous plasticity in the cyclic torsion of micron scale metallic wires

The plasticity of micron scale Cu and Au wires under cyclic torsion is investigated for the first time by using a torsion balance technique. In addition to a size effect, a distinct Bauschinger effect and an anomalous plastic recovery, wherein reverse plasticity even occurs upon unloading, are unamb...

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Published in:Physical review letters 2013-06, Vol.110 (24), p.244301-244301, Article 244301
Main Authors: Liu, Dabiao, He, Yuming, Dunstan, D J, Zhang, Bo, Gan, Zhipeng, Hu, Peng, Ding, Huaming
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cited_by cdi_FETCH-LOGICAL-c311t-71f1538a664559af1f60a1def1de71e61d520c11767764937036691916945dae3
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container_issue 24
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container_title Physical review letters
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creator Liu, Dabiao
He, Yuming
Dunstan, D J
Zhang, Bo
Gan, Zhipeng
Hu, Peng
Ding, Huaming
description The plasticity of micron scale Cu and Au wires under cyclic torsion is investigated for the first time by using a torsion balance technique. In addition to a size effect, a distinct Bauschinger effect and an anomalous plastic recovery, wherein reverse plasticity even occurs upon unloading, are unambiguously revealed. The Bauschinger effect and plastic recovery have been observed in molecular dynamics and discrete dislocation dynamics simulations of ideal single-crystal wires; the results here are an excellent confirmation that these effects also occur in experiment in nonideal polycrystalline wires. A physical model consistent with the simulations is described in which the geometrically necessary dislocations induced by the nonuniform deformation in torsion play the key role in these anomalous plastic behaviors.
doi_str_mv 10.1103/PhysRevLett.110.244301
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title Anomalous plasticity in the cyclic torsion of micron scale metallic wires
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