Table of Contents
Journal of Metallurgy
Volume 2014, Article ID 346328, 6 pages
Research Article

Characteristics of Anodized Layer in Investment Cast Ni50Ti50 Shape Memory Alloy

1Central Metallurgical R&D Institute (CMRDI), P.O. Box 87, Helwan, Cairo, Egypt
2Institue of Materials Science and Engineering, TU Clausthal, Agricolastr. 6, 38678 Clausthal-Zellerfeld, Germany

Received 27 December 2013; Accepted 6 January 2014; Published 25 February 2014

Academic Editor: Michael E. Kassner

Copyright © 2014 Shimaa H. El-Hadad 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.


NiTi shape memory alloys are promising implant materials due to their shape memory effect and super elasticity. In the current study, some Ni50Ti50 (mass %) SMAs samples were prepared by investment casting. These samples were then anodized and thermally treated to improve the surface properties. A fully saturated oxide layer was obtained. The structure and hardness properties of the anodized surfaces were then investigated. A hard porous layer with no free Ni atoms could be obtained which can be used as prebiomimetic surface for biological application.