Laser beam operation mode dependent grain morphology of alumina

Journal Article · Sat Dec 15 00:00:00 EST 2007 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2825403· OSTI ID:21057547

Samant, Anoop N; Harimkar, Sandip P; Dahotre, Narendra B ^[1]

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1. Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996 (United States)

The effect of laser beam operation mode on transition of grain morphology was studied during surface modification of alumina ceramic. A 4 kW HL 4006D continuous wave Nd:yttrium-aluminum-garnet (YAG) laser and a JK 701 pulsed Nd:YAG laser were employed to conduct surface modification of alumina. The laser beam operated in continuous wave mode generated faceted grain structure on the surface of the ceramic while the beam operated in pulsed mode produced nonfaceted grain structure. Such transition in grain morphology is mainly attributed to different levels of undercooling which is a function of cooling rates encountered in two different modes of laser operation.

• OSTI ID: 21057547
• Journal Information: Journal of Applied Physics, Vol. 102, Issue 12; Other Information: DOI: 10.1063/1.2825403; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CERAMICS
CRYSTAL STRUCTURE
LASER MATERIALS
MICROSTRUCTURE
MORPHOLOGY
NEODYMIUM LASERS
SUBCOOLING
SURFACE TREATMENTS