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Title: An investigation of the effects of ductile-layer thickness on the fracture behavior of nickel aluminide microlaminates

Abstract

This article presents the results of a combined experimental and analytical study of the effects of ductile-layer thickness on the initiation toughness and resistance-curve behavior of nickel aluminide composites that are reinforced with ductile V and Nb-15Al-40Ti layers. The initiation toughness and specimen-independent steady-state toughness values are shown to increase with increasing layer thickness. Stable crack growth and toughening in the crack-arrestor orientation are also attributed to crack bridging and the interactions of crack tips with the ductile layers. The overall toughening in the microlaminates is modeled by superposing the shielding contributions due to crack bridging on the stress-intensity factor required to promote renucleation ahead of the first ductile layer ahead of the precrack. The implications of the results are also discussed for the design of ductile phase-toughened microlaminates.

Authors:
;
Publication Date:
Research Org.:
Ohio State Univ., Columbus, OH (US)
OSTI Identifier:
20075681
Resource Type:
Journal Article
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
Journal Volume: 31; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 1073-5623
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; FRACTURE PROPERTIES; NICKEL ALLOYS; ALUMINIUM ALLOYS; VANADIUM; NIOBIUM ALLOYS; TITANIUM ALLOYS; COMPOSITE MATERIALS; LAYERS; CRACK PROPAGATION; FRACTURE MECHANICS

Citation Formats

Li, M., and Soboyejo, W.O. An investigation of the effects of ductile-layer thickness on the fracture behavior of nickel aluminide microlaminates. United States: N. p., 2000. Web. doi:10.1007/s11661-000-0257-1.
Li, M., & Soboyejo, W.O. An investigation of the effects of ductile-layer thickness on the fracture behavior of nickel aluminide microlaminates. United States. doi:10.1007/s11661-000-0257-1.
Li, M., and Soboyejo, W.O. Mon . "An investigation of the effects of ductile-layer thickness on the fracture behavior of nickel aluminide microlaminates". United States. doi:10.1007/s11661-000-0257-1.
@article{osti_20075681,
title = {An investigation of the effects of ductile-layer thickness on the fracture behavior of nickel aluminide microlaminates},
author = {Li, M. and Soboyejo, W.O.},
abstractNote = {This article presents the results of a combined experimental and analytical study of the effects of ductile-layer thickness on the initiation toughness and resistance-curve behavior of nickel aluminide composites that are reinforced with ductile V and Nb-15Al-40Ti layers. The initiation toughness and specimen-independent steady-state toughness values are shown to increase with increasing layer thickness. Stable crack growth and toughening in the crack-arrestor orientation are also attributed to crack bridging and the interactions of crack tips with the ductile layers. The overall toughening in the microlaminates is modeled by superposing the shielding contributions due to crack bridging on the stress-intensity factor required to promote renucleation ahead of the first ductile layer ahead of the precrack. The implications of the results are also discussed for the design of ductile phase-toughened microlaminates.},
doi = {10.1007/s11661-000-0257-1},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
issn = {1073-5623},
number = 5,
volume = 31,
place = {United States},
year = {2000},
month = {5}
}