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Surface effects in pulsed laser beam irradiated shape memory alloys

C. M. CRACIUNESCU1,* , R. M. MIRANDA2, R. J. C. SILVA3, E. ASSUNÇÃO4, F. M. BRAZ FERNANDES3

Affiliation

  1. Politehnica University of Timisoara, P-ta Victoriei nr. 2, 3006 Timisoara, Romania
  2. UNIDEMI, Departamento de Engenharia Mecânica e Industrial, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
  3. CENIMAT/I3N, Faculdade de Ciências e Tecnologia (FCT), UNL, 2829-516 – Monte de Caparica, Portugal
  4. Cranfield University - Cranfield, MK43 0AL, United Kingdom

Abstract

The goal of the work is to comparatively assess the effect of laser irradiation on the surface of shape memory alloys for several less common alloy families. The effect of pulsed laser impingement on the composition of NiTi shape memory alloys is analyzed for different compositions and manufacturing paths, with the aim to locally reduce the Ni content and/or to use the laser as a precise selective tool to generate structural reinforcements in a partially sintered shape memory alloy prepared by mechanical alloying. For a Ni-Ti-Hf alloy, the superficial layer formed as a result of the surface re-melting shows major Ni loss. Fe-Mn-Si-Cr shape memory alloys revealed major oxidations that are drastically affecting the properties as a result of interaction with the laser beam, while for the Co-Ni-Ga alloys only minor compositional changes have been detected..

Keywords

Surface, Laser, Smart, Alloys composition, Glazing.

Submitted at: Dec. 3, 2014
Accepted at: Jan. 21, 2015

Citation

C. M. CRACIUNESCU, R. M. MIRANDA, R. J. C. SILVA, E. ASSUNÇÃO, F. M. BRAZ FERNANDES, Surface effects in pulsed laser beam irradiated shape memory alloys, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 1-2, pp. 45-49 (2015)