Generalized Thermo-Elastodynamics for Polycrystalline Metallic Thin Films in Response to Ultrafast Laser Heating
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2018 by the American Institute of Aeronautics and Astronautics. Ageneralized thermo-elastodynamic model applicable to investigating single- and polycrystalline metallic films for their coupled thermal-mechanical responses to ultrafast laser heating is presented. Built upon the two-temperature model, the governing field equations feature hyperbolic electron and lattice energy transports that admit finite propagation speed and incorporate a term of energy dissipation to the generation of thermally induced mechanical disturbance. Electron energy transport in polycrystalline thin film is investigated in-depth by considering temperature dependence and size effect due to film surface and grain boundary scattering. Numerical results generated using the generalized one-dimensional model for a single-crystalline gold film are favorably examined against published experimental data for validation. Several averaged grain diameters are considered to explore the coupled thermal-mechanical responses in polycrystalline gold films of different thicknesses to better understand the dynamics and size effect on energy transport subject to pulsed femtosecond laser.
Journal of Thermophysics and Heat Transfer
author list (cited authors)
Mao, X. u., & Steve Suh, C.