期刊
ACTA MATERIALIA
卷 57, 期 11, 页码 3157-3169出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.03.021
关键词
Nanocomposite; Bauschinger effect; X-ray diffraction; Line broadening; Plastic deformation
Nanocomposite wires composed of a multi-scale Cu matrix embedding Nb nanotubes are cyclically deformed in tension under synchrotron radiation in order to follow the X-ray peak profiles (position and width) during mechanical testing. The evolution of elastic strains vs. applied stress suggests the presence of phase-specific elasto-plastic regimes. The nature of the elasto-plastic transition is uncovered by the tangent modulus analysis and correlated to the microstructure of the Cu channels and the Nb nanotubes. Finally, a new criterion for the determination of the macroyield stress is given as the stress to which the macroscopic work hardening, theta(n) = d sigma(a)/d epsilon(0), becomes smaller than one third of the macroscopic elastic modulus. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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