Fatigue of Ni-Ai-Mo aligned eutectics at elevated temperatures |
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Authors: | J M Tartaglia N S Stoloff |
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Affiliation: | (1) Climax Molybdenum Company of Michigan, P.O. Box 1568, 48106 Ann Arbor, MI;(2) Rensselaer Polytechnic Institute, 12181 Troy, NY |
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Abstract: | The elevated-temperature mechanical behavior of two aligned eutectics (Ni-8.1 wt pct Al-26.4 wt pct Mo and Ni-6.3 wt pct Al-31.2
wt pct Mo) has been investigated utilizing monotonic and cyclic testing in vacuum. Tensile yield strength and fatigue resistance
increased from 25 to 725 °C, but then were reduced at 825 °C. The fatigue lives of specimens tested at 725 °C decreased sharply
with decreasing frequency. A shift from surface to internal crack initiation was observed upon increasing the test temperature
from 725 to 825 °C. Stage II crack propagation was observed at both temperatures, in contrast to stage I cracking at 25 °C.
The test results are compared to those for other nickel and cobalt-base aligned eutectics to show that the frequency effect
on fatigue life is not limited to the Ni-AI-Mo system.
formerly Graduate Assistant in the Department of Materials Engineering, Rensselaer Polytechnic Institute |
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