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Fatigue and Fracture of Nb3 AI/Nb In Situ Composites Based on an Nb 18 at.% Al Alloy

Published online by Cambridge University Press:  01 January 1992

D.L. Davidson  and
D.L Anton
D.L. Davidson
Affiliation:
Southwest Research Institute, San Antonio, TX 78228
D.L Anton
Affiliation:
United Technologies Research Center, East Hartford, CT 06108
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Abstract

Near Nb3AI alloys, having Nb3Al with the ordered A15 crystalographic structure within regions of Nb solid solution, can be considered as in-situ reinforced composites. Nb-18 at.%AI ingots were arc melted and heat treated to provide several microstructures. Small compact tension specimens were cracked in compression- compression cyclic loading and subsequently grown in tension-tension cyclic loading. Fatigue crack growth rates were found to be similar to crack growth through a TiAI-based alloy with a lamellar microstructure. Threshold stress intensity factor was estimated as 5.3 MPaȡm, and fracture toughness as about 10 MPaȡm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 807
Copyright
Copyright © Materials Research Society 1995

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References

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