Abstract
This study investigated the effects of the types and length of nonmetallic inclusions on fatigue properties in rotating bending fatigue testing of Ti-Ni alloy fine wire. It was fabricated to include titanium carbides Ti(C,O) and titanium oxides Ti4Ni2Ox as either single phases or a mixture of both phases as nonmetallic inclusions in Ti-Ni alloy. The fatigue strength of Ti-Ni alloy depended on the number of nonmetallic inclusions of a length of ≥2 μm. Compared with Ti(C,O), Ti4Ni2Ox is coarse. It also exhibited a trend of readily forming particles and void assemblies, which are a defect morphology that originates from nonmetallic inclusions and readily act as crack origins of fatigue fractures.
Highlights
Ti-Ni alloy is a functional material that exhibits superelasticity and shapes memory properties.These characteristics are utilized in temperature sensors and actuators, such as in household appliances and electronics
Where there are no voids around the nonmetallic inclusions, fractureby surface wereThe measured
The lengths of and the nonmetallic observed in the surface of the wire samples electropolished as described in Section 2.1, as well as the particle and void assemblies (PVAs) and Figure 2 shows the Scanning electron microscopy (SEM) backscattered electron (BSE) images of the side surfaces of each sample
Summary
Ti-Ni alloy is a functional material that exhibits superelasticity and shapes memory properties. These characteristics are utilized in temperature sensors and actuators, such as in household appliances and electronics. Ti-Ni alloy has excellent corrosion resistance and biocompatibility, and is used in medical devices, such as guidewires and stents [1,2,3]. There are many studies about Ti-Ni alloy from various aspects, such as the improvement of corrosion resistance [4] and fretting behavior [5]. Stents are medical devices that expand and hold open narrowed areas of hollow anatomical structures, such as blood vessels, and are used for the treatment of circulatory diseases, which have been growing more prevalent in recent years. Ti-Ni alloy is flexible and is mainly used for cerebral blood vessels and lower limb blood vessels [6]
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