Pseudo-elastic and bio-chemical properties of Ti-Ni shape memory alloy wires micro-welded by YAG laser

Keisuke Uenishi; Masaya Takatsugu; Kojiro F. Kobayashi

doi:10.1117/12.540551

18 November 2003 Pseudo-elastic and bio-chemical properties of Ti-Ni shape memory alloy wires micro-welded by YAG laser

Keisuke Uenishi, Masaya Takatsugu, Kojiro F. Kobayashi

Proceedings Volume 5063, Fourth International Symposium on Laser Precision Microfabrication; (2003) https://doi.org/10.1117/12.540551
Event: Fourth International Symposium on Laser Precision Microfabrication, 2003, Munich, Germany

Abstract

In order to investigate the applicability of laser micro welding to the fabrication of medical devices, Ti-Ni based shape memory alloy biomaterials wires were micro spot melted by using YAG laser. By the optimization of laser conditions such as laser power or pulse duration, sound spot melted wires free from any defects were prepared and the width of the melted metal was reduced to about 0.2 mm for the 0.15 mm diameter wires. Compared with the SUS304 wires, melting of shape memory alloy wires needed more precise control of laser conditions although it needed smaller power input. Melted metal exhibited a rapidly quenched microstructure. The spot melted wires showed 70% of tensile strength and almost the same super-elastic behavior compared with base materials. Besides, it was confirmed by immersion test and by measurement of anodic polarization curve that NT-E4 wires still retain a sound corrosion resistance in a quasi biological environment by laser spot melting. Crosswise or parallel joints was also successfully prepared by laser spot welding of wires, suggesting the laser micro welding is applicable to the fabrication of biomedical devices.

Citation Download Citation

Keisuke Uenishi, Masaya Takatsugu, and Kojiro F. Kobayashi "Pseudo-elastic and bio-chemical properties of Ti-Ni shape memory alloy wires micro-welded by YAG laser", Proc. SPIE 5063, Fourth International Symposium on Laser Precision Microfabrication, (18 November 2003); https://doi.org/10.1117/12.540551

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KEYWORDS

Shape memory alloys

Metals

Laser welding

Corrosion

YAG lasers

Resistance

Medical devices

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