Effect of Nonmetallic Inclusions on Fatigue Properties of Superelastic Ti-Ni Fine Wire

Metals

Minoru Nishida¹  Yasunori Ide²  Fumiyoshi Yamashita²  Suguru Kato³  Takayuki Narushima³  Kyosuke Ueda³  Kouji Ishikawa⁴  Sumio Kise⁵ 

[1] Department of Advanced Materials Science and Engineering, Faculty of Engineering Sciences, Kyushu University, Fukuoka 816-8580, Japan;Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Science, Kyushu University, Fukuoka 816-8580, Japan;Department of Materials Processing, Tohoku University, Sendai 980-8579, Japan;Special Metals Division, Furukawa Techno Material Co., Ltd., Hiratsuka 254-0016, Japan;Technology Development Department, Special Metals Division, Furukawa Techno Material Co., Ltd., Hiratsuka 254-0016, Japan;

关键词: Ti-Ni alloy;    nonmetallic inclusions;    fatigue properties;    particle and void assembly;   

DOI  :  10.3390/met9090999

来源: DOAJ

【 摘 要 】

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 Ti₄Ni₂O_x 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), Ti₄Ni₂O_x 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.

【 授权许可】

Unknown