@conference {1611,
	title = {Creep, Fatigue, and Oxidation Interactions During High and Very High Cycle Fatigue at Elevated Temperature of Nickel-Based Single Crystal Superalloys},
	booktitle = {Superalloys 2020},
	year = {2020},
	abstract = {<p>
	High-temperature fatigue of Ni-based single crystal superalloys is studied at 1000 \&deg;C in a wide range of loading conditions (\&minus;1 ? R ? 0.8) and number of cycles (103 \&minus; 109). Under fully reversed conditions, a competition between crack initiations from the surface\&mdash; assisted by oxidation\&mdash;and from internal metallurgical defects\&mdash;mostly large casting pores\&mdash;is observed. Increasing the testing frequency shifts the competition to a higher number of cycles. Conversely, decreasing the casting pore size or coating the specimen promotes surface initiations. When a positive mean stress is added (R ? 0), a creep deformation/damage mechanism mainly controls fatigue life, despite fracture surfaces presenting a variety of initiation types. Fatigue life can be predicted by a simple creep law if the contribution of the alternating stress is considered. A linear damage summation method that considers pure fatigue and pure creep damage is used to predict the fatigue lives, and Haigh diagrams for different alloys are presented.
</p>
},
	keywords = {Creep, fatigue, High temperature, Superalloy},
	isbn = {9783030518349},
	doi = {10.1007/978-3-030-51834-9},
	url = {http://dx.doi.org/10.1007/978-3-030-51834-9_65},
	author = {Cervellon, A. and Yi, J. Z. and Corpace, F. and Hervier, Z. and Rigney, J. and Wright, P. K. and Torbet, C. J. and Cormier, J. and Jones, J. W. and Pollock, T. M.},
	editor = {Tin, Sammy and Hardy, Mark and Clews, Justin and Cormier, Jonathan and Feng, Qiang and Marcin, John and O{\textquoteright}Brien, Chris and Suzuki, Akane}
}
@article {1396,
	title = {Creep resistance of bulk copper{\textendash}niobium composites: An inverse effect of multilayer length scale},
	journal = {Acta Materialia},
	volume = {176},
	year = {2019},
	pages = {189{\textendash}198},
	abstract = {<p>
	Metallic multilayer systems show promising performance in extreme environments, with high stability of bi-metal interfaces down to nanometer length scales. The creep behavior of bulk, accumulative roll bonded (ARB) Copper\&ndash;Niobium (Cu\&ndash;Nb) composites has been studied at 400 \&deg;C as a function of layer thickness, ranging from 2 \&mu;m to 65 nm. Similar to single phase metallic systems, three regimes are observed during creep: transient, steady-state and tertiary. The mechanism controlling minimum creep rate for all conditions tested has a strong dependence on stress, consistent with dislocation-dominated creep. Unlike the conventional effect of grain size on creep resistance, this study reveals that decreasing length scale increases creep resistance.
</p>
},
	keywords = {Creep, Cu-Nb, Length scale, Multilayer},
	issn = {13596454},
	doi = {10.1016/j.actamat.2019.06.029},
	url = {https://doi.org/10.1016/j.actamat.2019.06.029},
	author = {Avallone, Jaclyn T. and Nizolek, Thomas J. and Bales, Benjamin B. and Pollock, Tresa M.}
}
