Length-scale effects on fracture of multilayers

Fracture of Ti/TiN multilayer specimens was studied in situ inside a transmission electron microscope. Fracture toughness for cracks propagating perpendicular to the multilayers is found to be thickness dependent, varying from 1.45 to 2.45 MPa-m 0.5 as the specimen thickness increased from 150 to 30...

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Bibliographic Details
Published inScripta materialia Vol. 63; no. 2; pp. 196 - 199
Main Authors Kumar, S., Zhuo, D., Wolfe, D.E., Eades, J.A., Haque, M.A.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.07.2010
Subjects
Columnar structure
Electron microscopes
Fracture mechanics
Fracture toughness
Grain structure
Mathematical models
Multilayer thin films
Multilayers
Nanocrystalline microstructure
Propagation
Titanium
Toughness testing
Transmission electron microscopy
Toughness testing
Nanocrystalline microstructure
Transmission electron microscopy
Multilayer thin films
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Summary:Fracture of Ti/TiN multilayer specimens was studied in situ inside a transmission electron microscope. Fracture toughness for cracks propagating perpendicular to the multilayers is found to be thickness dependent, varying from 1.45 to 2.45 MPa-m 0.5 as the specimen thickness increased from 150 to 300 nm. Single-mode crack renucleation was observed in the metals layers, which is anomalous to the continuum-based elastic–plastic multilayer fracture model predictions. This is explained by the ultrafine columnar grain structure in the metal layers.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2010.03.051