Nitinol (NiTi) has become one of the most important implant materials in biomedical applications such as endovascular stents, embolic protection filters, and endodontic files. However, NiTi stents sometimes do not provide satisfactory visibility under fluoroscopy during angioplasty. A new ternary alloy, radiopaque nitinol (NiTiPt), exhibits much better radiopacity than NiTi and has great potential for future biomedical applications. This paper presents the first characterization of anisotropic stress-strain behavior in micron-sized specimens cut directly from hypotubes of this new alloy NiTiPt. Experimental results show that NiTiPt hypotube has very different anisotropic characteristics and high stress-strain nonlinearity when compared to its NiTi counterpart. Its ultimate tensile strength and strain are approximately 15-40% higher than NiTi with statistically significant difference for all three cutting angles measured. Its stress-strain behavior has several unique features including lower initial austenite elastic modulus, smaller hysteresis loop, and sharper tails during the loading-unloading cycle. The 458 behavior is particularly different from other angles, with stronger hardening effect and an approximately 25-30% reduction in ultimate strain when compared to 08.
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