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Advances in Materials Science and Engineering
Volume 2013, Article ID 198434, 4 pages
http://dx.doi.org/10.1155/2013/198434
Research Article

Cutting NiTi with Femtosecond Laser

1IST-UTL Instituto Superior Técnico, Universidade Técnica de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
2Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
3UNIDEMI, Departamento de Engenharia Mecânica e Industrial, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
4CENIMAT/I3N, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
5Department of Mechanical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1

Received 4 May 2013; Accepted 30 July 2013

Academic Editor: Yuanhua Lin

Copyright © 2013 L. Quintino et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Superelastic shape memory alloys are difficult to machine by thermal processes due to the facility for Ti oxidation and by mechanical processes due to their superelastic behavior. In this study, femtosecond lasers were tested to analyze the potential for machining NiTi since femtosecond lasers allow nonthermal processing of materials by ablation. The effect of processing parameters on machining depth was studied, and material removal rates were computed. Surfaces produced were analyzed under SEM which shows a resolidified thin layer with minimal heat affected zones. However, for high cutting speeds, that is, for short interaction times, this layer was not observed. A depletion of Ni was seen which may be beneficial in biomedical applications since Ni is known to produce human tissue reactions in biophysical environments.