Abstract:
A non contact technique is presented, that provides information on thermal properties at the cubic micron scale in metal surfaces. It makes use of the appearance of bumps originated in the thermoelastic deformation of the surface induced by laser heating with a modulated beam. The heat diffusion and thermal expansion give rise to a surface deformation shaping a modulated bump at the laser modulation frequency. A second beam is reflected at the bump and the collected amplitude depends both on the change in reflectivity with temperature (thermoreflectance) and the deflection of the beam due to the surface deformation (photodeflection). Filtering the reflected signal with an adjusTable knife edge the photodeflection signal can be enhanced. A complete analytical model is presented that takes into account both mechanisms. A critical modulating frequency appears at which the heat diffuses the entire laser beam diameter in one modulation period. From the determination of that critical frequency the local heat diffusivity can be determined. Experimental results are presented on poor conducting metallic glasses, confirming the theoretical predictions.
Registro:
| Documento: |
Conferencia
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| Título: | Microscopic characterization of metallic surfaces by photoinduced thermoelastic bumps |
| Autor: | Martínez, O.E.; Balzarotti, F.; Mingolo, N. |
| Ciudad: | Vienna |
| Filiación: | Departamento de Física, FCEN, Universidad de Buenos Aires, Buenos Aires, Argentina
Departamento de Física, Facultad de Ingeniería, Universidad de Buenos Aires, Buenos Aires, Argentina
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| Palabras clave: | Alloys; Deformation; Heat treating furnaces; Heat treatment; Laser heating; Lasers; Liquid metals; Metallic compounds; Metallic glass; Metals; Modulation; Quenching; Surface analysis; Surface diffusion; Surface treatment; Technology; Thermal expansion; Thermal spraying; Thermodynamic properties; Thermoelasticity; Analytical modelling; Beam diameters; Critical frequencies; Heat diffusions; International Federation for Heat Treatment; Knife edge; Laser modulation; Local heating; Metal surfaces; Metallic glasses; Metallic surfaces; Micron-scale; Microscopic characterization; Modulation period; Non-contact; Photo-induced; Reflected signals; Surface deformations; Surface engineering; Thermal properties; Surface properties |
| Año: | 2006
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| Página de inicio: | 490
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| Página de fin: | 494
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| Título revista: | 15th IFHTSE - International Federation for Heat Treatment and Surface Engineering Congress 2006
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| Título revista abreviado: | Proc. IFHTSE - Int. Fed. Heat Treat. Surf. Eng. Cong. 2006
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| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_39013841_v_n_p490_Martinez |
Referencias:
- Li, B., Roger, J.P., Pottier, L., Fournier, D., Complete thermal characterization of film-on-substrate system by modulated thermoreflectance microscopy and multiparameter fitting (1999) Journal of Applied Physics, 86 (9), pp. 5314-5317
- Founier, D., Thermal-wave probing at various spatial scales (2001) MRS Bulletin , Jun2 2001, pp. 465-470
- Gillet, Y., Bissieux, C., Diffusion harmonique de la chaleur appliquée au contrôle non destructif par méthodes photothermiques. (1999) International Journal of Thermal Science, 38, pp. 530-533
- Landi, S.M., Martínez, O.E., Quenching The Thermal Contribution In Laser Assisted Scanning Tunneling Microscopy (2000) Journal of Applied Physics, 88, pp. 4840-4844
- Mansanares, A.M., Velinov, T., Bozoki, Z., Fournier, D., And Boceara, A.C., Photothermal microscopy: Thermal contrast at grain interface in sintered metallic materials (1994) Journal of Applied Physics, 75, pp. 3344-3350
- Opsal, J., Rosencwaig, A., Willenborg, D.L., Thermal wave detection and thin film thickness measurements with laser beam deflection (1983) Applied Optics, 22, pp. 3169-3176
- Rosencwaig, A., Opsal, J., Willenborg, D.L., Thin film thickness measurements with thermal waves (1983) Applied Physics Letters, 43, pp. 166-168
- Rosencwaig, A., Opsal, J., Smith, W.L., Willenborg, D.L., Detection of thermal waves through optical reflectance (1985) Applied Physics Letters, 46, pp. 1013-1015A4 - AICHELIN Heat Treatment Systems; Air Liquide; Bodycote; EBNER; MESSER
Citas:
---------- APA ----------
Martínez, O.E., Balzarotti, F. & Mingolo, N.
(2006)
. Microscopic characterization of metallic surfaces by photoinduced thermoelastic bumps. 15th IFHTSE - International Federation for Heat Treatment and Surface Engineering Congress 2006, 490-494.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_39013841_v_n_p490_Martinez [ ]
---------- CHICAGO ----------
Martínez, O.E., Balzarotti, F., Mingolo, N.
"Microscopic characterization of metallic surfaces by photoinduced thermoelastic bumps"
. 15th IFHTSE - International Federation for Heat Treatment and Surface Engineering Congress 2006
(2006) : 490-494.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_39013841_v_n_p490_Martinez [ ]
---------- MLA ----------
Martínez, O.E., Balzarotti, F., Mingolo, N.
"Microscopic characterization of metallic surfaces by photoinduced thermoelastic bumps"
. 15th IFHTSE - International Federation for Heat Treatment and Surface Engineering Congress 2006, 2006, pp. 490-494.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_39013841_v_n_p490_Martinez [ ]
---------- VANCOUVER ----------
Martínez, O.E., Balzarotti, F., Mingolo, N. Microscopic characterization of metallic surfaces by photoinduced thermoelastic bumps. Proc. IFHTSE - Int. Fed. Heat Treat. Surf. Eng. Cong. 2006. 2006:490-494.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_39013841_v_n_p490_Martinez [ ]
