Thermal dynamics-based mechanism for intense laser-induced material surface vaporization

Pramana

Baldev Raj¹  A K Tyagi¹  S Dash¹  N Kumar1¹ 

[1] Materials Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India$$

关键词: Pulsed laser–material interaction;    plasma cloud;    phase transition.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Laser material processing involving welding, ablation and cutting involves interaction of intense laser pulses of nanosecond duration with a condensed phase. Such interaction involving high brightness radiative flux causes multitude of non-linear events involving thermal phase transition at soild–liquid–gas interfaces. A theoretical perspective involving thermal dynamics of the vaporization process and consequent non-linear multiple thermal phase transitions under the action of laser plasma is the subject matter of the present work. The computational calculations were carried out where titanium (Ti) was treated as a condensed medium. The solution to the partial differential equations governing the thermal dynamics and the underlying phase transition event in the multiphase system is based on non-stationary Eulerian variables. The Mach number 𝑀 depicts significant fluctuations due to thermal instabilities associated with the laser beam flux and intensity. A conclusive amalgamation has been established which relates material surface temperature profile to laser intensity, laser flux and the pressure in the plasma cloud.

【 授权许可】

Unknown