Direct Observation of Crack Propagation in Copper–Niobium Multilayers-Reference-Cited by-同舟云学术

Direct Observation of Crack Propagation in Copper–Niobium Multilayers

Published:2012-03-27 Issue:2 Volume:134 Page:
ISSN:0094-4289
Container-title:Journal of Engineering Materials and Technology
language:en
Short-container-title:

Author:

Hattar K.¹,Misra A.²,Dosanjh M. R. F.³,Dickerson P.²,Robertson I. M.⁴,Hoagland R. G.²

Affiliation:

1. Materials Science and Engineering, University of Illinois; Sandia National Laboratories, Albuquerque, NM 87185-1056

2. Los Alamos National Laboratory, Los Alamos, NM 87545

3. Sandia National Laboratories, Albuquerque, NM 87185-1056, New Mexico Institute of Mining and Technology, Socorro, NM 87801

4. Materials Science and Engineering, University of Illinois, Urbana, IL 61801

Abstract

The failure of a cross-sectional 65 nm-thick copper and 150 nm-thick niobium multilayer thin film was investigated via an in situ transmission electron microscopy straining experiment. The fracture of the free-standing multilayer films was associated with confined dislocation slip within layers containing and preceding the crack tip. Four crack hindrance mechanisms were observed to operate during crack propagation: microvoid formation, crack deviation, layer necking, and crack blunting. Failure was observed to occur across and through the copper and niobium layers but never within the interfaces or grain boundaries. These results are discussed relative to the length-scale-dependent deformation mechanisms of nanoscale metallic multilayers.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Link

http://asmedigitalcollection.asme.org/materialstechnology/article-pdf/doi/10.1115/1.4005953/5562927/021014_1.pdf

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