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Dislocation Confinement and Ultimate Strength in Nanoscale Metallic Multilayers

Published online by Cambridge University Press:  01 February 2011

Qizhen Li  and
Peter M. Anderson
Qizhen Li
Affiliation:
Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210, U.S.A.
Peter M. Anderson
Affiliation:
Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210, U.S.A.
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Abstract

In nanostructured metallic multilayers, hardness and strength are greatly enhanced compared to their microstructured counterparts. As layer thickness is decreased, three different regions are frequently observed: the first region shows Hall-Petch behavior; the second region shows an even greater dependence on layer thickness; and the third region exhibits a plateau or softening of hardness and strength. The second and third regions are studied using our discrete dislocation simulation method. This method includes the effects of stress due to lattice mismatch, misfit dislocation substructure, and applied stress on multilayer strength. To do so, we study the propagation of existing threading and interfacial dislocations as the applied stress is increased to the macroyield point. Our results show that in region 2, dislocation propagation is confined to individual layers initially. This “confined layer slip” builds up interfacial content and redistributes stress so that ultimately, the structure can no longer confine slip. The associated macroyield stress in this region depends strongly on layer thickness. In region 3, layers are so thin that confined layer slip is not possible and the macroyield stress reaches a plateau that is independent of layer thickness.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 791: Symposium Q – Mechanical Properties of Nanostructured Materials and Nanocomposites , 2003 , Q5.19
Copyright
Copyright © Materials Research Society 2004

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References

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