Interface effects on the strength and ductility of bimodal nanostructured metals

Interface effects on the strength and ductility of bimodal nanostructured metals Bimodal nanostructured (NS) metals possess both ultrahigh strength and good ductility. It is the nanograined (NG) matrix phase that leads to their ultrahigh strength and the coarse-grained (CG) inclusion phase that renders their good ductility. But the overall strength and ductility can also be significantly affected by the behavior of the interface regions. In this study, we employ a cohesive finite-element method to investigate the tensile fracture process of the bimodal NS Cu that includes the interface effects. We develop three types of cohesive elements in the bimodal NS Cu: (i) cohesive elements in the CG phase, (ii) those in the NG phase, and (iii) those at the CG–NG interface. Our objective is to uncover how the strength and ductility of the bimodal NS Cu can be affected by the interface property. In this process, we will also examine how the distribution and shape of the CG inclusions can contribute to the variation of the tensile fracture behavior of the bimodal NS Cu. By an extensive simulation, we find that, even at the small ratio of 1.6% of interface cohesive elements to all cohesive elements, a small change in the cohesive strength of interface elements could lead to a significant change in the overall strength and ductility. We also find that, when the cohesive strength of interface elements exceeds a certain level, the strength and ductility of the bimodal NS Cu will reach a saturation state. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Mechanica Springer Journals

Interface effects on the strength and ductility of bimodal nanostructured metals

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer-Verlag GmbH Austria, part of Springer Nature
Subject
Engineering; Theoretical and Applied Mechanics; Classical and Continuum Physics; Continuum Mechanics and Mechanics of Materials; Structural Mechanics; Vibration, Dynamical Systems, Control; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0001-5970
eISSN
1619-6937
D.O.I.
10.1007/s00707-018-2181-8
Publisher site
See Article on Publisher Site

Abstract

Bimodal nanostructured (NS) metals possess both ultrahigh strength and good ductility. It is the nanograined (NG) matrix phase that leads to their ultrahigh strength and the coarse-grained (CG) inclusion phase that renders their good ductility. But the overall strength and ductility can also be significantly affected by the behavior of the interface regions. In this study, we employ a cohesive finite-element method to investigate the tensile fracture process of the bimodal NS Cu that includes the interface effects. We develop three types of cohesive elements in the bimodal NS Cu: (i) cohesive elements in the CG phase, (ii) those in the NG phase, and (iii) those at the CG–NG interface. Our objective is to uncover how the strength and ductility of the bimodal NS Cu can be affected by the interface property. In this process, we will also examine how the distribution and shape of the CG inclusions can contribute to the variation of the tensile fracture behavior of the bimodal NS Cu. By an extensive simulation, we find that, even at the small ratio of 1.6% of interface cohesive elements to all cohesive elements, a small change in the cohesive strength of interface elements could lead to a significant change in the overall strength and ductility. We also find that, when the cohesive strength of interface elements exceeds a certain level, the strength and ductility of the bimodal NS Cu will reach a saturation state.

Journal

Acta MechanicaSpringer Journals

Published: May 30, 2018

References

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