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High-Temperature Fatigue Crack Propagation in P/M Ni3Al-B Alloys

Published online by Cambridge University Press:  28 February 2011

K.-M. Chang ,
S.C. Huang  and
A.I. Taub
K.-M. Chang
Affiliation:
General Electric Corporate Research and Development, Materials Laboratory Schenectady, New York 12301
S.C. Huang
Affiliation:
General Electric Corporate Research and Development, Materials Laboratory Schenectady, New York 12301
A.I. Taub
Affiliation:
General Electric Corporate Research and Development, Materials Laboratory Schenectady, New York 12301
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Abstract

Ductile Ni3Al-B type intermetallic alloys show a unique fatigue crack growth behavior at elevated temperatures. A crack propagation mechanism has been investigated in an experimental P/M alloy by testing the alloys with different fatigue frequencies at 400°C. The Ni3Al-B intermetallic alloy shows a substantial time-dependence of fatigue cracl growth rate when tested in air. Under a given cyclic stress intensity, an order of magnitude difference of crack growth rate was observed by decreasing the fatigue frequency. However, such a time-dependence did not occur when the alloy was tested in vacuum. It is concluded that “dynamic” embrittlement in an oxidation environment is the major factor controlling the fatigue crack growth in ordered Ni3Al-B alloys at elevated temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 81: Symposium H – High-Temperature Ordered Intermetallic Alloys II , 1986 , 303
Copyright
Copyright © Materials Research Society 1987

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References

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