Effects of temperature and environment on the tensile and fatigue crack growth behavior of a Ni3AI-base alloy |
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Authors: | W Matuszyk G Camus D J Duquette N S Stoloff |
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Affiliation: | (1) Knolls Atomic Power Laboratories, 12301 Schenectady, NY;(2) Laboratory of Composite Thermostructures, 33600, PESSAC, France;(3) Materials Engineering Department, Rensselaer Polytechnic Institute, 12180-3590 Troy, NY |
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Abstract: | The effects of temperature, frequency, and environment on the tensile and cyclic deformation behavior of a nickel aluminide
alloy, Ni-9.0 wt pct Al-7.97 pct Cr-1.77 pct Zr (IC-221), have been determined. The tensile properties were obtained in vacuum
at elevated temperatures and in air at room temperature. The alloy was not notch sensitive at room temperature or at 600 °C,
unlike Cr-free Ni3Al + B alloys. In general, crack growth rates of IC-221 increased with increasing temperature, decreasing frequency, exposure
to air, or testing at higherR ratios. At 25 °C, crack growth rates were slightly higher than for a previously investigated Cr-free Ni3Al alloy. However, at 600 °C, the crack growth rates for IC-221 were lower than for the Cr-free alloy. Substantial frequency
effects were noted on crack growth of IC-221 at both 600 °C and 800 °C in both air and vacuum, especially at highK. The relative contributions of creep and environmental interactions to fatigue crack growth are discussed. |
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