Non-Equilibrium Phase Change in Metal Induced by Nanosecond Pulsed Laser Irradiation

[+] Author and Article Information
Xianfan Xu, David A. Willis

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

J. Heat Transfer 124(2), 293-298 (Nov 16, 2001) (6 pages) doi:10.1115/1.1445792 History: Received April 30, 2001; Revised November 16, 2001
Copyright © 2002 by ASME
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(a) p-T Diagram and (b) typical variations of physical properties of liquid metal near the critical point. The substrate “o” denotes properties at the normal boiling temperature.
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(a) Transient locations of the vapor front as a function of laser fluence; and (b) vapor velocity as a function of laser fluence.
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Transient transmissivity of vapor as a function of laser fluence
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Percent of laser energy scattered to the ambient as a function of laser fluence
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Ablation depth as a function of laser fluence
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Comparison between the Clausius-Clapeyron relation and the measured pressure at 0.9 Tc
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Comparison between the measured ablation depth and the values calculated using transient pressure data and the equilibrium kinetic relation
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Onset of evaporation as a function of laser fluence determined from the transient location of the vapor front and from the transient transmissivity through the vapor




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