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The Mechanical Properties of A Ni-30Al-2OFe-0.05Zr Intermetallic Alloy in the Temperature Range 300–1200 K.

Published online by Cambridge University Press:  26 February 2011

S. V. Raj ,
R. D. Noebe  and
I. E. Locci
S. V. Raj
Affiliation:
NASA Lewis Research Center, MS 49–1, Cleveland, OH 44135.
R. D. Noebe
Affiliation:
NASA Lewis Research Center, MS 49–1, Cleveland, OH 44135.
I. E. Locci
Affiliation:
NASA Lewis Research Center, MS 49–1, Cleveland, OH 44135.
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Abstract

Tensile tests were conducted on an extruded Ni-30(at.%)Al-20Fe-0.05Zr intermetallic alloy in the temperature range 300–1200 K and the microstructures were characterized by optical, scanning and transmission electron microscopy. The alloy did not exhibit any room temperature ductility and failed by transgranular cleavage at a stress of about 710 MPa. This mode of fracture was observed at and below 873 K with the total ductility being less than 2.5%. However, the failure mode changed to dimpled fracture, triple point cracking and rupture above 873 K. Scanning electron microscopy of the fracture surfaces revealed that transgranular cleavage failure had always originated at pre-existing defects. In these cases, the fracture stress exhibited a good correlation with the defect size in accordance with linear elastic fracture mechanics, where the critical stress intensity factor was estimated to be about 4 MPa m1/2.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 673
Copyright
Copyright © Materials Research Society 1991

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References

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