Campus Units

Materials Science and Engineering, Ames Laboratory

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

4-2014

Journal or Book Title

Journal of Materials Science

Volume

49

Issue

7

First Page

2787

Last Page

2794

DOI

10.1007/s10853-013-7982-5

Abstract

Deformation processed metal–metal composites (DMMCs) are high-strength, high-electrical conductivity composites developed by severe plastic deformation of two ductile metal phases. The extraordinarily high strength of DMMCs is underestimated using the rule of mixture (or volumetric weighted average) of conventionally work-hardened metals. In this article, a dislocation-density-based, strain–gradient–plasticity model is proposed to relate the strain-gradient effect with the geometrically necessary dislocations emanating from the interface to better predict the strength of DMMCs. The model prediction was compared with the experimental findings of Cu–Nb, Cu–Ta, and Al–Ti DMMC systems to verify the applicability of the new model. The results show that this model predicts the strength of DMMCs better than the rule-of-mixture model. The strain-gradient effect, responsible for the exceptionally high strength of heavily cold worked DMMCs, is dominant at large deformation strain since its characteristic microstructure length is comparable with the intrinsic material length.

Comments

This is a manuscript of an article published as Tian, Liang, Alan Russell, and Iver Anderson. "A dislocation-based, strain–gradient–plasticity strengthening model for deformation processed metal–metal composites." Journal of Materials Science 49, no. 7 (2014): 2787-2794. The final publication is available at Springer via DOI: 10.1007/s10853-013-7982-5. Posted with permission.

Copyright Owner

Springer Science+Business Media New York

Language

en

File Format

application/pdf

Published Version

Share

COinS