Length-scale effects on fracture of multilayers

S. Kumar; D. Zhuo; D. E. Wolfe; J. A. Eades; M. A. Haque

doi:10.1016/j.scriptamat.2010.03.051

Length-scale effects on fracture of multilayers

S. Kumar, D. Zhuo, D. E. Wolfe, J. A. Eades, M. A. Haque

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	196-199
Number of pages	4
Journal	Scripta Materialia
Volume	63
Issue number	2
DOIs	https://doi.org/10.1016/j.scriptamat.2010.03.051
State	Published - Jul 2010

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2010.03.051

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abstract = "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-m0.5 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.",

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AU - Kumar, S.

AU - Zhuo, D.

AU - Wolfe, D. E.

AU - Eades, J. A.

AU - Haque, M. A.

PY - 2010/7

Y1 - 2010/7

N2 - 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-m0.5 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.

AB - 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-m0.5 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.

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SP - 196

EP - 199

JO - Scripta Materialia

JF - Scripta Materialia

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Length-scale effects on fracture of multilayers

Abstract

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