Influence of repetitive pulsed laser irradiation on the surface characteristics of an aluminum alloy in the melting regime

Title
Influence of repetitive pulsed laser irradiation on the surface characteristics of an aluminum alloy in the melting regime
Authors
장경영
Keywords
Near-infrared pulsed laser; Aluminum alloy; Melting; Surface morphology; Surface roughness; Surface hardness
Issue Date
2015-01
Publisher
KOREAN SOC MECHANICAL ENGINEERS
Citation
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, v. 29, NO 1, Page. 335-340
Abstract
We have investigated the influence of repetitive near-infrared (NIR) pulsed laser shots in the melting regime on the surface characteristics of an aluminum 6061-T6 alloy. Characteristics of interest include surface morphology, surface roughness, and surface hardness in the melted zone as well as the size of the melted zone. For this study, the proper pulse energy for inducing surface melting at one shot is selected using numerical simulations that calculate the variation in temperature at the laser beam spot for various input pulse energies in order to find the proper pulse energy for raising the temperature to the melting point. In this study, 130 mJ was selected as the input energy for a Nd:YAG laser pulse with a duration of 5 ns. The size of the melted zone measured using optical microscopy (OM) increased logarithmically with an increasing shot number. The surface morphology observed by scanning electron microscopy (SEM) clearly showed a re-solidified microstructure evolution after surface melting. The surface roughness and hardness were measured by atomic force microscopy (AFM) and nano-indentation, respectively. The surface roughness showed almost no variation due to the surface texturing after laser shots over 10. The hardness inside the melted zone was lower than that outside the zone because the beta '' phase was transformed to a beta phase or dissolved into a matrix.
URI
http://hdl.handle.net/20.500.11754/21417https://link.springer.com/article/10.1007%2Fs12206-014-1131-1
ISSN
1738-494X
DOI
http://dx.doi.org/10.1007/s12206-014-1131-1
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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