Localized detection of phase transition in tungsten by laser ultrasonics
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Date
2013
Authors
Utegulov, Z.N.
Reese, S.J.
Farzbod, F.
Schley, R.S.
Hurley, D.H.
Journal Title
Journal ISSN
Volume Title
Publisher
Nazarbayev University
Abstract
We demonstrated a method for localized, furnace-free detection of the onsets of melting and ablation in polycrystalline tungsten using nanosecond laser ultrasonics. Pulsed laserinduced melting is characterized by a delay in the arrival of the shear wave with increasing laser peak intensity. Pulse-laser induced ablation was characterized by pronounced increase of the amplitude of the signal associated with the arrival of longitudinal acoustic wave. Both phenomena are attributed to a change in character of the ultrasonic source. The described technique suggests a new spatially resolved method for detection of metal-to-melt phase transition in refractory metals.
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Keywords
first research week, innovative scientific research, laser irradiation