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Fracture Toughness and the Effects of Stress State on Fracture of Nickel Aluminides

Published online by Cambridge University Press:  28 February 2011

John J. Lewandowski ,
Gary M. Michal ,
Ivan Locci  and
Joseph D. Rigney
John J. Lewandowski
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
Gary M. Michal
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
Ivan Locci
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
Joseph D. Rigney
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
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Abstract

The effects of stress state on the fracture behavior of Ni3Al, Ni3Al + B, and NiAl were determined using either notched, or fatigue-precracked bend bars tested to failure at room temperature, in addition to testing specimens in tension under superposed hydrostatic pressure. Although Ni3AI is observed to fail in a macroscopically brittle intergranular manner in tension tests conducted at room temperature, the fracture toughnesses (i.e. K IC presently obtained on Ni3Al exceeded 20 MPa1m and R-curve behavior was exhibited. In-situ monitoring of the fracture experiments was utilized to aid in interpreting the source(s) of the high toughness in Ni3Al, while SEM fractography was utilized to determine the operative fracture modes. The superposition of hydrostatic pressure during tensile testing of NiAl specimens was observed to produce increased ductility without changing the fracture mode.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 186: Symposium I – Alloy Phase Stability and Design , 1990 , 341
Copyright
Copyright © Materials Research Society 1991

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