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

Oleh:

Willis, David A. ; Xianfan, Xu

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 124 no. 2 (Apr. 2002), page 293-298.
Topik: laser; non - equilibrium; phase change; metal induced; pulse laser irradiation

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.3 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Materials processing using high power pulsed lasers involves complex phenomena including rapid heating, superheating of the laser - melted material, rapid nucleation, and phase explosion. With a heating rate on the order of 109 K/s or higher, the surface layer melted by laser irradiation can reach a temperature higher than the normal boiling point. On the other hand, the vapor pressure does not build up as fast and thus falls below the saturation pressure at the surface temperature, resulting in a superheated, metastable state. As the temperature of the melt approaches the thermodynamic critical point, the liquid undergoes a phase explosion that turns the melt into a mixture of liquid and vapor. This article describes heat transfer and phase change phenomena during nanosecond pulsed laser ablation of a metal, with an emphasis on phase explosion and non - equilibrium phase change. The time required for nucleation in a superheated liquid, which determines the time needed for phase explosion to occur, is also investigated from both theoretical and experimental viewpoints.

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