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MRS Online Proceedings Library (OPL) MRS Online Proceedings Library (OPL)

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Fatigue/Creep Interactions in Ni3Al-Base Alloys

Published online by Cambridge University Press:  26 February 2011

G. M. Camus ,
D. J. Duquette  and
N. S. Stoloff
G. M. Camus
Affiliation:
Materials Engineering Department Rensselaer Polytechnic Institute Troy, New York 12180-3590
D. J. Duquette
Affiliation:
Materials Engineering Department Rensselaer Polytechnic Institute Troy, New York 12180-3590
N. S. Stoloff
Affiliation:
Materials Engineering Department Rensselaer Polytechnic Institute Troy, New York 12180-3590
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Abstract

Stress-controlled fatigue tests and fatigue crack growth rate tests respectively have been carried out on two Ni3Al Cr/Zr alloys, IC 218 at 600°C and 800°C, and IC 221 at 800°C, in vacuum, at various test frequencies. Decreasing the test frequency and/or increasing the temperature leads to a decrease in the number of cycles to failure, and a gradual disappearance of a fatigue fracture zone. In fatigue crack propagation tests, the crack growth rate only decreases at the lowest frequency and remains constant in the major part of the frequency range investigated. The fatigue propagation mode in all cases is intergranular. These trends are shown in both cases to be related to a true creep component but, under fatigue crack growth test conditions, crack blunting intervenes gradually as the frequency is decreased, leading therefore to a less severe frequency effect.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 579
Copyright
Copyright © Materials Research Society 1989

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