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Fracture of B2 Aluminide Single Crystals

Published online by Cambridge University Press:  26 February 2011

Kehi-Minn Chang ,
R. Darolia  and
H.A. Lipsitt
Kehi-Minn Chang
Affiliation:
Ge Corporate Research and Development, Schenectady, NY 12301
R. Darolia
Affiliation:
GE Aircraft Engines, Evendale, OH 45215
H.A. Lipsitt
Affiliation:
Wright State University, Dayton, OH 45435
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Abstract

Single crystals of B2 aluminides, including FeAl, NiAl, and CoAl, were tested to investigate their fracture behavior. Specimens were aligned along specific orientations of the crystal lattice. Both uniaxial tension and notched bend tests revealed a cleavage fracture in all crystals. The cleavage occurred along a specific crystalline plane: {100} for FeAl; {110} for NiAl and CoAl. A model based on the ordering energy of unlike atoms is proposed to explain the preferred cleavage plane in these B2 structures. Fracture on transient planes around {115} are observed in NiAl before the crack growth continues on a cleavage plane.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 597
Copyright
Copyright © Materials Research Society 1991

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References

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