Generalized model for laser-induced surface structure in metallic glass |
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| Institution: | 1.LTCS and Department of Mechanics & Engineering Science, College of Engineering, Peking University, Beijing 100871, China;2.Center for Applied Physics and Technology, Peking University, Beijing 100871, China;3.China Institute of Atomic Energy, Beijing 102413, China |
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| Abstract: | The details of the special three-dimensional micro-nano scale ripples with a period of hundreds of microns on the surfaces of a Zr-based and a La-based metallic glass irradiated separately by single laser pulse are investigated.We use the small-amplitude capillary wave theory to unveil the ripple formation mechanism through considering each of the molten metallic glasses as an incompressible viscous fluid.A generalized model is presented to describe the special morphology,which fits the experimental result well.It is also revealed that the viscosity brings about the biggest effect on the monotone decreasing nature of the amplitude and the wavelength of the surface ripples.The greater the viscosity is,the shorter the amplitude and the wavelength are. |
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| Keywords: | metallic glasses pulse laser processing micro-nano scale surface structure viscosity |
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