This work reports on a pump–probe laser-based heating and sensing metrology to study the failure mechanisms of materials during extreme heat fluxes localized near surfaces, the localization of which is controlled by the focus of the laser beam and sensed by the reflection of a secondary probe laser. We focus the demonstration of these power density at failure tests on the damage mechanisms of commercially pure titanium metal during and after high heat fluxes induced from the absorbed laser energy. Using this steady-state thermoreflectance pump–probe metrology, a localized region of the material was irradiated at a low modulated frequency, while the average change in the thermoreflectance signal was monitored. We observe surface and cross-sectional oxidation of the titanium, revealing correlations between microstructural evolution events and shifts in thermoreflectance trends as a function of absorbed power density. Furthermore, the damage morphology was shown to be heavily influenced by the size of the heater (dictated by the radius of the pump laser beam), which controlled the relative degree of thermomechanical, melting, and oxidative decohesion failure mechanisms in the samples. The analysis of the temperature distribution coupled with the observed microstructural damage gives rise to a high-throughput experimental technique to induce desired deformation modes through cyclic thermal testing.
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7 February 2022
Research Article|
February 02 2022
Detection of sub-micrometer thermomechanical and thermochemical failure mechanisms in titanium with a laser-based thermoreflectance technique
Special Collection:
Engineering and Understanding of Thermal Conduction Materials
Kathleen Quiambao-Tomko;
Kathleen Quiambao-Tomko
1
Department of Materials Science and Engineering, University of Virginia
, Charlottesville, Virginia 22904, USA
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Richard R. White;
Richard R. White
1
Department of Materials Science and Engineering, University of Virginia
, Charlottesville, Virginia 22904, USA
2
Nanoscale Materials Characterization Facility, Department of Materials Science and Engineering, University of Virginia
, Charlottesville, Virginia 22904, USA
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John A. Tomko
;
John A. Tomko
1
Department of Materials Science and Engineering, University of Virginia
, Charlottesville, Virginia 22904, USA
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Christina M. Rost
;
Christina M. Rost
3
Department of Physics and Astronomy James Madison, University 901 Carrier Drive
, Harrisonburg, Virgina 22807, USA
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Lavina Backman
;
Lavina Backman
1
Department of Materials Science and Engineering, University of Virginia
, Charlottesville, Virginia 22904, USA
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Elizabeth J. Opila;
Elizabeth J. Opila
1
Department of Materials Science and Engineering, University of Virginia
, Charlottesville, Virginia 22904, USA
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Patrick E. Hopkins
Patrick E. Hopkins
a)
1
Department of Materials Science and Engineering, University of Virginia
, Charlottesville, Virginia 22904, USA
4
Department of Mechanical and Aerospace Engineering, University of Virginia
, Charlottesville, Virginia 22904, USA
5
Department of Physics, University of Virginia
, Charlottesville, Virginia 22904, USA
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
Note: This paper is part of the Special Topic on Engineering and Understanding of Thermal Conduction in Materials.
J. Appl. Phys. 131, 055104 (2022)
Article history
Received:
August 29 2021
Accepted:
January 06 2022
Citation
Kathleen Quiambao-Tomko, Richard R. White, John A. Tomko, Christina M. Rost, Lavina Backman, Elizabeth J. Opila, Patrick E. Hopkins; Detection of sub-micrometer thermomechanical and thermochemical failure mechanisms in titanium with a laser-based thermoreflectance technique. J. Appl. Phys. 7 February 2022; 131 (5): 055104. https://doi.org/10.1063/5.0069094
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