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Tensile behavior of fully nanotwinned alloys with varying stacking fault energies

Published online by Cambridge University Press:  10 May 2017

Nathan M. Heckman ,
Leonardo Velasco  and
Andrea M. Hodge
Nathan M. Heckman
Affiliation:
Department of Aerospace and Mechanical Engineering, Mork Family Department of Chemical Engineering and Material Science, University of Southern California, Los Angeles, CA 900089, USA
Leonardo Velasco
Affiliation:
Department of Aerospace and Mechanical Engineering, Mork Family Department of Chemical Engineering and Material Science, University of Southern California, Los Angeles, CA 900089, USA Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Andrea M. Hodge*
Affiliation:
Department of Aerospace and Mechanical Engineering, Mork Family Department of Chemical Engineering and Material Science, University of Southern California, Los Angeles, CA 900089, USA
*
Address all Correspondence to Andrea M. Hodge at ahodge@usc.edu
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Abstract

In this study, a comparison of the tensile behavior of fully nanotwinned Cu–6 wt.%Al, Cu–2 wt.%Al, and Cu–10 wt.%Ni with stacking fault energies (SFEs) of 6, 37, and 60 mJ/m2, respectively is presented. The samples displayed yield strengths ranging from 830 to 1340 MPa, varying with both alloy content and microstructural parameters. All samples showed low ductility, even though there are tilted twin boundaries present in Cu–10 wt.%Ni. The influence of varying grain width is presented for each alloy and related to both the activation volume and SFE [Figs. 3(a)–3(c)].

Type
Research Letters
Information
MRS Communications , Volume 7 , Issue 2 , June 2017 , pp. 253 - 258
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Copyright
Copyright © Materials Research Society 2017 

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