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Microcolumn development on titanium by multipulse laser irradiation in nitrogen

Published online by Cambridge University Press:  31 January 2011

E. György ,
A. Pérez del Pino ,
P. Serra  and
J. L. Morenza
E. György
Affiliation:
Universitat de Barcelona, Departament de Física Aplicada i Òptica, Avda. Diagonal 647, E-08028 Barcelona, Spain
A. Pérez del Pino
Affiliation:
Universitat de Barcelona, Departament de Física Aplicada i Òptica, Avda. Diagonal 647, E-08028 Barcelona, Spain
P. Serra
Affiliation:
Universitat de Barcelona, Departament de Física Aplicada i Òptica, Avda. Diagonal 647, E-08028 Barcelona, Spain
J. L. Morenza*
Affiliation:
Universitat de Barcelona, Departament de Física Aplicada i Òptica, Avda. Diagonal 647, E-08028 Barcelona, Spain
*
b) Address all correspondence to this author. e-mail: jmorenza@fao.ub.es
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Abstract

We report the growth of titanium nitride microcolumns under multipulse Nd:yttrium aluminum garnet (λ = 1.064 μm, τ ∼ 300 ns, ν = 30 kHz) laser irradiation of titanium targets in nitrogen atmosphere. The laser intensity value was chosen below the single-pulse melting threshold of titanium. The evolution with the number of laser pulses of the target morphology, crystalline state, and chemical composition at the surface as well as in depth were investigated by scanning electron microscopy, x-ray diffractometry, Raman spectroscopy, and wavelength dispersive x-ray spectroscopy. Under the action of the laser pulses, during progressive surface nitridation, an initial rippled morphology developed, which evolved with further irradiation to TiN microcolumns. In-depth investigations showed a granular zone beneath the surface consisting of rutile and anatase phase TiO2, followed by a compact needlelike layer of titanium until the interface with the unaffected target material.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 9 , September 2003 , pp. 2228 - 2234
Copyright
Copyright © Materials Research Society 2003

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