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Title: Al{sub 2}O{sub 3}-Ni composites with high strength and fracture toughness

Abstract

Al{sub 2}O{sub 3}-Ni composites were prepared by the reactive hot pressing of Al and NiO. The composites had a two-phase, interpenetrating microstructure and contained {approximately}35 vol% Ni. They exhibited an impressively high combination of strength and toughness at room temperature; the four-point bending strength was in excess of 600 MPa with a fracture toughness of more than 12 MPa{sm_bullet}m{sup 1/2}. Examination of fracture surfaces showed that Ni ligaments underwent ductile deformation during fracture. SEM analysis revealed knife-edged Ni ligaments with a limited amount of debonding around their periphery (i.e., at the Ni-Al{sub 2}O{sub 3} interface), indicating a strong Ni-Al{sub 2}O{sub 3} bond.

Authors:
; ;
Publication Date:
Research Org.:
Univ. of Missouri, Rolla, MO (US)
OSTI Identifier:
20075979
Alternate Identifier(s):
OSTI ID: 20075979
Resource Type:
Journal Article
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 83; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0002-7820
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HOT PRESSING; MICROSTRUCTURE; FRACTURE PROPERTIES; ALUMINIUM OXIDES; NICKEL; COMPOSITE MATERIALS; FRACTOGRAPHY; INTERFACES; SCANNING ELECTRON MICROSCOPY

Citation Formats

Fahrenholtz, W.G., Ellerby, D.T., and Loehman, R.E. Al{sub 2}O{sub 3}-Ni composites with high strength and fracture toughness. United States: N. p., 2000. Web.
Fahrenholtz, W.G., Ellerby, D.T., & Loehman, R.E. Al{sub 2}O{sub 3}-Ni composites with high strength and fracture toughness. United States.
Fahrenholtz, W.G., Ellerby, D.T., and Loehman, R.E. Mon . "Al{sub 2}O{sub 3}-Ni composites with high strength and fracture toughness". United States.
@article{osti_20075979,
title = {Al{sub 2}O{sub 3}-Ni composites with high strength and fracture toughness},
author = {Fahrenholtz, W.G. and Ellerby, D.T. and Loehman, R.E.},
abstractNote = {Al{sub 2}O{sub 3}-Ni composites were prepared by the reactive hot pressing of Al and NiO. The composites had a two-phase, interpenetrating microstructure and contained {approximately}35 vol% Ni. They exhibited an impressively high combination of strength and toughness at room temperature; the four-point bending strength was in excess of 600 MPa with a fracture toughness of more than 12 MPa{sm_bullet}m{sup 1/2}. Examination of fracture surfaces showed that Ni ligaments underwent ductile deformation during fracture. SEM analysis revealed knife-edged Ni ligaments with a limited amount of debonding around their periphery (i.e., at the Ni-Al{sub 2}O{sub 3} interface), indicating a strong Ni-Al{sub 2}O{sub 3} bond.},
doi = {},
journal = {Journal of the American Ceramic Society},
issn = {0002-7820},
number = 5,
volume = 83,
place = {United States},
year = {2000},
month = {5}
}