Nanosecond laser polishing of laser nitrided Zr-based metallic glass surface

Nanosecond pulsed laser nitriding is a promising technique for improving the surface hardness of Zr-based metallic glass (MG). However, being different from conventional surface enhancement methods, this method generally results in irregular surface profile and poor surface roughness, which impedes...

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Bibliographic Details
Published in:	International journal of advanced manufacturing technology 2022-07, Vol.121 (5-6), p.4099-4113
Main Authors:	Huang, Hu, Hong, Jing, Qian, Yongfeng, Wang, Chao, Zhang, Zhiyu, Zhang, Lin
Format:	Article
Language:	eng
Subjects:	Amorphous materials CAE) and Design Computer-Aided Engineering (CAD Corrosion prevention Engineering Industrial and Production Engineering Industrial applications Lasers Machining Mechanical Engineering Mechanical properties Media Management Metallic glasses Morphology Nanosecond pulses Nitriding Original Article Polishing Pulsed lasers Surface hardness Surface roughness
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Summary:	Nanosecond pulsed laser nitriding is a promising technique for improving the surface hardness of Zr-based metallic glass (MG). However, being different from conventional surface enhancement methods, this method generally results in irregular surface profile and poor surface roughness, which impedes its potential industrial applications and popularization. Here, nanosecond laser polishing (LP), as a novel post-machining flattening approach, is introduced to flatten the laser nitrided Zr-based MG surface. The effects of the LP parameters, i.e., laser power, scanning speed, and track overlap, on the micro-topography and surface roughness ( S a and S q) of the laser nitrided MG surface are systematically investigated, as well as the surface hardness variation. Compared with the laser nitrided Zr-based MG surface, homogeneous surface morphologies are achieved by LP with a remarkable reduction on surface roughness ( S a) by 93.7%, 72.9%, and 84.6% on three demonstrated laser nitrided MG surfaces. Most of the defects occurred in laser nitriding are removed under the optimal LP conditions. According to the residual micro-morphology on the LP surface, two kinds of mechanisms in LP are discussed. This study demonstrates that LP is an important alternative to effectively improve the surface roughness and mechanical performance of laser nitrided Zr-based MG, which would be meaningful and significant for the functional applications of MG in bio-chemical and anti-corrosion interface.
ISSN:	0268-3768 1433-3015