| Analysis of Variation in the Surface Morphology of Aluminum Alloy by Repetitive Pulsed-laser Irradiation |
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Sung-Ho Choi, Chung-Seok Kim, Kyung-Young Jhang, Wan-Soon Shin |
1Hanyang University
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| 반복적인 펄스레이저 조사에 의한 알루미늄 합금의 표면상태 변화분석 |
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최성호, 김정석, 장경영, 신완순 |
1한양대학교
2국방과학연구소 |
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| Abstract |
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The objective of this study is to investigate the thermal behavior on material surface and the variation in the surface morphology of aluminum 6061 alloy by the Nd:YAG pulsed-laser irradiation. First, we predicted the surface temperature variation during pulsed-laser irradiation by using the two dimensional finite element analysis. When the pulsed-laser of 133 mJ energy and 5 ns pulse duration is irradiated on the surface of aluminum alloy, the material surface is thought to be melting because the surface temperature rises steadily up to about $660^{circ}C$ exceeding the melting point. Also, the experimental results show that the solidification microstructure has been developed clearly after surface melting. Second, the diameter of melted zone was analysed by finite element analysis and measured by OM(Optical Microscopy). It increased logarithmically with increase in the number of laser irradiation. In addition, AFM(Atomic Force Microscopy) measurement showed an increase in the average surface roughness during pulsed-laser irradiation. |
| Key Words:
Pulsed-laser, Finite Element Analysis, Heat Transfer, Diameter of Melted Zone |
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