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Forced chemical mixing at Cu-Nb interfaces under severe plastic deformation

Published online by Cambridge University Press:  07 June 2012

Nhon Q. Vo ,
Robert S. Averback ,
Yinon Ashkenazy ,
Pascal Bellon  and
Jian. Wang
Nhon Q. Vo*
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana Champaign, Urbana, Illinois 61801
Robert S. Averback
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana Champaign, Urbana, Illinois 61801
Yinon Ashkenazy
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana Champaign, Urbana, Illinois 61801; and Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem, Israel
Pascal Bellon
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana Champaign, Urbana, Illinois 61801
Jian. Wang
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
*
a)Address all correspondence to this author. e-mail: nhonvo2@illinois.edu
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Abstract

Forced chemical mixing during severe plastic deformation was investigated at Cu-Nb face-centered-cubic (fcc)/body-centered-cubic (bcc) interfaces using molecular-dynamics simulations. Three Cu-Nb interfaces were considered, with either Kurdjumov-Sachs or Nishiyama-Wassermann orientation relationship (OR) between fcc and bcc phases. Forced mixing of a spherical bcc-Nb precipitate in fcc-Cu was also studied for comparison. Deformation was imposed by shape-preserving cycles using two different modes, biaxial compression and biplanar shearing to investigate the effects of strain path. For biplanar shear, the chemical mixing rate is strongly dependent on structure of the interface, with the Kurdjumov-Sachs OR and a (111)Cu‖(110)Nb habit plane being particularly resistant to mixing. During compression, no such dependence was found. Influences of interface diffuseness and roughness on stability were also investigated. The simulations show the interface mixing is inversely related to interface shear strength during shear deformation, but dominated by dislocation-glide through the Cu phase and subsequent absorption at Cu-Nb interfaces during compression deformation.

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 12 , 28 June 2012 , pp. 1621 - 1630
Copyright
Copyright © Materials Research Society 2012

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