Fatigue Behavior of Vitallium-2000 Plus Alloy for Orthopedic Applications
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abstract
Vitallium-2000 Plus alloy is one of the important metallic biomaterials having excellent biocompatibility as it is free from nickel, vanadium, and beryllium elements that could cause potential allergic problems to patients. In this study, the high cycle fatigue behavior of continuous cast vitallium-2000 Plus alloy was investigated using rotation bend fatigue tests at 50 Hz frequency and at room temperature apart from tensile studies. A series of tests were carried out at varying stresses, and the S-N curve was obtained fromregression of the test data. The endurance limit was determined as 387 MPa, which is verygood for a cast alloy. This increase in fatigue property (compared to the previous version of this alloy) is primarily due to the presence of nitrogen that is added during continuous casting process and also that of the other alloying elements. Tensile test was also performed as per the ASTM standard to evaluate its static properties. The fracture morphology was investigated using scanning electron microscope to study the mechanisms of fracture. It was established that the primary mechanism of fracture was by microvoid nucleation and coalescence, typical of a ductile material that is significant for a cast alloy. The experimentally determined values of endurance limit, yield strength, tensile strength, and percent elongation provide evidence that vitallium-2000 Plus cast alloy has very goodfatigue, tensile properties, and increased formability without fracture, allowing for excellent adjustability during its application. ASM International.
