Low-cycle fatigue in Ni3Al-based alloys

Autor: D. E. Gordon, C. K. Unni
Rok vydání: 1991
Předmět:
Zdroj: Journal of Materials Science. 26:6183-6189
ISSN: 1573-4803
0022-2461
DOI: 10.1007/bf01113902
Popis: The low-cycle fatigue properties of hot-extruded powders of a Ni3Al-based alloy, IC 218, with nominal composition Ni-16.5Al-8.0Cr-0.4Zr-0.1B (at %) have been evaluated at room temperature. Tests were conducted under total strain conditions in a laboratory air environment. Results indicate that the low-cycle fatigue performance of the PM processed IC 218 nickel aluminide is superior to other structural alloys especially at higher strain amplitudes. These results are explained in terms of the high ductility of the fine-grain material and good crack growth propagation resistance in these alloys. Stress response curves for annealed IC 218 alloys indicate considerable cyclic hardening followed by cyclic softening. The onset of cyclic softening is found to occur at a constant cumulative plastic strain. The critical cumulative plastic strain criteria are verified for step-loaded IC 218 nickel aluminide coupons.
Databáze: OpenAIRE
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