A new Mechanism for a ripple microstructure formation on surface of brass induced by nanosecond pulse laser
首发时间:2009-01-12
Abstract:A new forming mechanism for a ripple microstructure on the surface of brass, which induced by a linear polarized nanosecond pulse laser, is suggested from the plasma electrons quivering motion in laser field. In the interaction of laser generated plasma (gas-phase) and melted brass (liquid-phase), the quivering motion of electrons results inevitable in the distribution of the electronic mass stream density along the laser electric field by which the surface of liquid brass is suffered from a period pressure as well as resulted in a period vorticity in the presupposition of incompressible liquid. After laser pulse the period geometric structure on the surface of liquid brass generated by the period vorticity is retained when the cooling rate of the liquid surface layer is faster than the heat diffusion rate inside the liquid. This present forming mechanism can well explain our experiment phenomenon.
keywords: ripple linear polarized laser mechanism microstructure
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A new Mechanism for a ripple microstructure formation on surface of brass induced by nanosecond pulse laser
摘要:A new forming mechanism for a ripple microstructure on the surface of brass, which induced by a linear polarized nanosecond pulse laser, is suggested from the plasma electrons quivering motion in laser field. In the interaction of laser generated plasma (gas-phase) and melted brass (liquid-phase), the quivering motion of electrons results inevitable in the distribution of the electronic mass stream density along the laser electric field by which the surface of liquid brass is suffered from a period pressure as well as resulted in a period vorticity in the presupposition of incompressible liquid. After laser pulse the period geometric structure on the surface of liquid brass generated by the period vorticity is retained when the cooling rate of the liquid surface layer is faster than the heat diffusion rate inside the liquid. This present forming mechanism can well explain our experiment phenomenon.
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