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Open AccessArticle

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

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Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Science, Kyushu University, Fukuoka 816-8580, Japan
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Technology Development Department, Special Metals Division, Furukawa Techno Material Co., Ltd., Hiratsuka 254-0016, Japan
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Department of Materials Processing, Tohoku University, Sendai 980-8579, Japan
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Special Metals Division, Furukawa Techno Material Co., Ltd., Hiratsuka 254-0016, Japan
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Department of Advanced Materials Science and Engineering, Faculty of Engineering Sciences, Kyushu University, Fukuoka 816-8580, Japan
*
Author to whom correspondence should be addressed.
Metals 2019, 9(9), 999; https://doi.org/10.3390/met9090999
Received: 5 August 2019 / Revised: 4 September 2019 / Accepted: 6 September 2019 / Published: 11 September 2019
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. View Full-Text
Keywords: Ti-Ni alloy; nonmetallic inclusions; fatigue properties; particle and void assembly Ti-Ni alloy; nonmetallic inclusions; fatigue properties; particle and void assembly
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MDPI and ACS Style

Yamashita, F.; Ide, Y.; Kato, S.; Ueda, K.; Narushima, T.; Kise, S.; Ishikawa, K.; Nishida, M. Effect of Nonmetallic Inclusions on Fatigue Properties of Superelastic Ti-Ni Fine Wire. Metals 2019, 9, 999.

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