@article {1856,
	title = {Foreword: {\textquotedblleft}Eurosuperalloys 2022{\textquotedblright}},
	journal = {Metallurgical and Materials Transactions A},
	volume = {54},
	year = {2023},
	month = {03},
	doi = {10.1007/s11661-023-07021-z},
	author = {Cormier, Jonathan and Pollock, Tresa}
}
@article {1346,
	title = {Fatigue deformation in a polycrystalline nickel base superalloy at intermediate and high temperature: Competing failure modes},
	journal = {Acta Materialia},
	volume = {152},
	year = {2018},
	pages = {16{\textendash}33},
	abstract = {<p>
	The microstructural configurations that favor early strain localization and fatigue crack initiation at intermediate and high temperature (400 \&deg;C\&ndash;650 \&deg;C) have been investigated using novel experimental techniques, including high resolution digital image correlation and transmission scanning electron microscopy. Cyclic fatigue experiments in the high and low cycle fatigue regimes have been performed on a Ren\&eacute; 88DT polycrystalline nickel-base superalloy at temperatures up to 650 \&deg;C and compared to previous fatigue results obtained from tests in the very high cycle fatigue regime. Competing failure modes are observed along with an inversion in the temperature fatigue life dependence of fatigue strength from the low to high cycle fatigue regime. Oxidation-assisted processes are dominant at high applied stresses while cyclic plastic localization and accumulation govern fracture at low applied stresses. In addition, a second competing mode exists in the high and very high cycle fatigue regime from non-metallic inclusions as compared to internal intrinsic initiation sites. The grain-scale features that exhibit strain localization and crack initiation were investigated in detail. Transmission electron microscopy (TEM), transmission scanning electron microscopy (TSEM) and electron channeling contrast imaging have been conducted on samples removed from targeted regions with microstructural configurations that favor crack initiation to characterize the associated dislocation sub-structure and its evolution with temperature. Plasticity is observed to be less localized during cyclic loading at high temperature compared to room temperature. The microstructural features that drive initiation across the temperature range investigated are: twin-parent grains pairs that are at the upper end of the size distribution, are oriented for near maximum elastic modulus mismatch, and have high stresses along planes parallel to the twin boundaries.
</p>
},
	keywords = {Coherent twin boundary, Elastic anisotropy, Fatigue crack initiation at intermediate and high temperature, High resolution digital image correlation, Microstructural effect, Polycrystalline microstructure, Ren{\'e} 88DT polycrystalline superalloy, Strain localization},
	issn = {13596454},
	doi = {10.1016/j.actamat.2018.03.035},
	url = {https://doi.org/10.1016/j.actamat.2018.03.035},
	author = {Stinville, Jean Charles and Martin, Etienne and Karadge, Mallikarjun and Ismonov, Shak and Soare, Monica and Hanlon, Tim and Sundaram, Sairam and Echlin, Mclean P. and Callahan, Patrick G. and Lenthe, William C. and Miller, V. M. and Miao, Jiashi and Wessman, Andrew E. and Finlay, Rebecca and Loghin, Adrian and Marte, Judson and Pollock, Tresa M.}
}
@article {1486,
	title = {Femtosecond laser rejuvenation of nanocrystalline metals},
	journal = {Acta Materialia},
	volume = {156},
	year = {2018},
	pages = {183{\textendash}195},
	abstract = {<p>
	Nanocrystalline metals are distinct from traditional engineering materials due to their high concentration of grain boundaries and corresponding structural disorder at grain boundaries. The effect of local disorder in nanocrystalline materials manifests in ways reminiscent of fully amorphous materials, such as mesoscale shear localization and pressure-dependent yielding, owing to the high concentration of grain boundaries and their predominance in governing plasticity. Relaxation processes in nanocrystalline materials that facilitate reconfigurations of grain boundaries and lower their energy, such as low temperature annealing, have been shown to enhance mechanical strength. However, processes that raise the energy of a nanocrystalline metal have not been observed, limiting the tunability of properties and the prospect for suppressing shear localization. Here, we use femtosecond laser processing as a unique non-equilibrium process that can generate complex stress states due to ultrafast electronic excitation and subsequent relaxation events. Experiments on nanocrystalline Al-O and Cu-Zr alloys indicate that sub-ablation femtosecond laser pulses cause up to an 87\% reduction in hardness with no change in grain size, which can be ascribed to grain boundary-mediated processes. Parallels between our results and rejuvenation processes in glassy systems will be discussed in the context of controlling metastable structural configurations through novel processing routes.
</p>
},
	keywords = {Femtosecond lasers, Grain boundaries, Nanocrystalline, Rejuvenation},
	issn = {13596454},
	doi = {10.1016/j.actamat.2018.06.027},
	url = {https://doi.org/10.1016/j.actamat.2018.06.027},
	author = {Balbus, Glenn H. and Echlin, Mclean P. and Grigorian, Charlette M. and Rupert, Timothy J. and Pollock, Tresa M. and Gianola, Daniel S.}
}
@article {1231,
	title = {Forward models for extending the mechanical damage evaluation capability of resonant ultrasound spectroscopy},
	journal = {Ultrasonics},
	volume = {77},
	year = {2017},
	pages = {183{\textendash}196},
	doi = {10.1016/j.ultras.2017.02.002},
	author = {Goodlet, B.r. and Torbet, C.j. and Biedermann, E.j. and Jauriqui, L.m. and Aldrin, J.c. and Pollock, T.m.}
}
@article {echlin2016femtosecond,
	title = {Femtosecond Laser Damage in Metals and Semiconductors During TriBeam Tomography},
	journal = {Microsc. Microanal},
	volume = {22},
	year = {2016},
	pages = {3},
	author = {Echlin, MP and Titus, M and Lenthe, WC and Straw, M and Gumbsch, P and Pollock, TM and Fraunhofer, IWM}
}
@article {jorgensen2015femtosecond,
	title = {Femtosecond laser ablation and nanoparticle formation in intermetallic NiAl},
	journal = {Applied Surface Science},
	volume = {353},
	year = {2015},
	pages = {700{\textendash}707},
	publisher = {North-Holland},
	author = {Jorgensen, David J and Titus, Michael S and Pollock, Tresa M}
}
@article {pollock2013feedback,
	title = {The feedback loop between theory, simulation and experiment for plasticity and property modeling},
	journal = {Current Opinion in Solid State and Materials Science},
	volume = {17},
	number = {1},
	year = {2013},
	pages = {10{\textendash}18},
	publisher = {Elsevier},
	author = {Pollock, Tresa M and LeSar, Richard}
}
@article {pollock2013femtosecond,
	title = {Femtosecond Laser Tomography Using the TriBeam System},
	journal = {Microscopy and Microanalysis},
	volume = {19},
	number = {S2},
	year = {2013},
	pages = {698{\textendash}699},
	publisher = {Cambridge Univ Press},
	author = {Pollock, TM and Echlin, MP and Mottura, A}
}
@conference {mottura2012first,
	title = {A First Principles Study of the Effect of Ti and Ta on the SFE of the registered{\textquoteright} Phase of Co-based Superalloys},
	booktitle = {AIP Conference Proceedings},
	year = {2012},
	publisher = {American Institute of Physics, Ste. 1 NO 1 Melville NY 11747-4502 United States},
	organization = {American Institute of Physics, Ste. 1 NO 1 Melville NY 11747-4502 United States},
	author = {Mottura, Alessandro and Janotti, Anderson and Pollock, Tresa}
}
@article {mottura2012first,
	title = {A first-principles study of the effect of Ta on the superlattice intrinsic stacking fault energy of L1 2-Co 3 (Al, W)},
	journal = {Intermetallics},
	volume = {28},
	year = {2012},
	pages = {138{\textendash}143},
	publisher = {Elsevier},
	author = {Mottura, Alessandro and Janotti, Anderson and Pollock, Tresa M}
}
@article {madison2012fluid,
	title = {Fluid flow and defect formation in the three-dimensional dendritic structure of nickel-based single crystals},
	journal = {Metallurgical and Materials Transactions A},
	volume = {43},
	number = {1},
	year = {2012},
	pages = {369{\textendash}380},
	publisher = {Springer},
	author = {Madison, J and Spowart, JE and Rowenhorst, DJ and Aagesen, LK and Thornton, K and Pollock, TM}
}
@article {das2009femtosecond,
	title = {Femtosecond laser machining of cooling holes in thermal barrier coated CMSX4 superalloy},
	journal = {Journal of Materials Processing Technology},
	volume = {209},
	number = {15},
	year = {2009},
	pages = {5661{\textendash}5668},
	publisher = {Elsevier},
	author = {Das, Dipak K and Pollock, Tresa M}
}
@article {das2009formation,
	title = {Formation of secondary reaction zone in ruthenium bearing nickel based single crystal superalloys with diffusion aluminide coatings},
	journal = {Materials Science and Technology},
	volume = {25},
	number = {2},
	year = {2009},
	pages = {300{\textendash}308},
	publisher = {Taylor \& Francis},
	author = {Das, DK and Gleeson, B and Murphy, KS and Ma, S and Pollock, TM}
}
@article {mcdonald2008femtosecond,
	title = {Femtosecond pulsed laser ablation dynamics and ablation morphology of nickel based superalloy CMSX-4},
	journal = {Journal of Applied Physics},
	volume = {103},
	number = {9},
	year = {2008},
	pages = {093111},
	publisher = {AIP Publishing},
	author = {McDonald, Joel P and Ma, Shuwei and Pollock, Tresa M and Yalisove, Steven M and Nees, John A}
}
@article {das2008femtosecond,
	title = {Femtosecond pulsed laser damage characteristics of 7\% Y2O3-ZrO2 thermal barrier coating},
	journal = {Applied Physics A},
	volume = {91},
	number = {3},
	year = {2008},
	pages = {421{\textendash}428},
	publisher = {Springer},
	author = {Das, DK and McDonald, JP and Yalisove, SM and Pollock, TM}
}
@article {das2008formation,
	title = {Formation of secondary reaction zones in diffusion aluminide-coated Ni-base single-crystal superalloys containing ruthenium},
	journal = {Metallurgical and Materials Transactions A},
	volume = {39},
	number = {7},
	year = {2008},
	pages = {1647{\textendash}1657},
	publisher = {Springer},
	author = {Das, Dipak K and Murphy, Kenneth S and Ma, Shuwei and Pollock, Tresa M}
}
@article {ma2007femtosecond,
	title = {Femtosecond laser ablation regimes in a single-crystal superalloy},
	journal = {Metallurgical and Materials Transactions A},
	volume = {38},
	number = {13},
	year = {2007},
	pages = {2349{\textendash}2357},
	publisher = {Springer},
	author = {Ma, S and McDonald, JP and Tryon, B and Yalisove, SM and Pollock, TM}
}
@article {suzuki2007flow,
	title = {Flow stress anomalies in $\gamma$/$\gamma$' two-phase Co{\textendash}Al{\textendash}W-base alloys},
	journal = {Scripta Materialia},
	volume = {56},
	number = {5},
	year = {2007},
	pages = {385{\textendash}388},
	publisher = {Elsevier},
	author = {Suzuki, Akane and DeNolf, Garret C and Pollock, Tresa M}
}
@article {feng2006femtosecond,
	title = {Femtosecond laser machining of single-crystal superalloys through thermal barrier coatings},
	journal = {Materials Science and Engineering: A},
	volume = {430},
	number = {1},
	year = {2006},
	pages = {203{\textendash}207},
	publisher = {Elsevier},
	author = {Feng, Q and Picard, YN and McDonald, JP and Van Rompay, PA and Yalisove, SM and Pollock, TM}
}
@article {feng2005femtosecond,
	title = {Femtosecond laser micromachining of a single-crystal superalloy},
	journal = {Scripta materialia},
	volume = {53},
	number = {5},
	year = {2005},
	pages = {511{\textendash}516},
	publisher = {Elsevier},
	author = {Feng, Q and Picard, YN and Liu, H and Yalisove, SM and Mourou, G and Pollock, TM}
}
@article {bird1986flow,
	title = {Flow localization during plane strain punch stretching of a ferrite-austenite steel},
	journal = {Metallurgical Transactions A},
	volume = {17},
	number = {9},
	year = {1986},
	pages = {1537{\textendash}1546},
	publisher = {Springer},
	author = {Bird, JE and Pollock, T and Srivastava, SK}
}
@article {pollock1984failure,
	title = {Failure by shear during plane strain stretching of a duplex steel},
	journal = {TMS (The Metallurgical Society) Paper Selection;(USA)},
	volume = {56},
	number = {CONF-840909{\textendash}},
	year = {1984},
	author = {Pollock, TM and Bird, JE and Srivastava, SK}
}
