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Phase Transformation Behavior and Shape Memory Characteristics of Ti-Ni-Cu-Mo Alloys
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Tae-Hyun Nam1), Jung-Phil Noh1), Shin-Goo Hur2), Ji-Soon Kim3) and Seung-Baik Kang4)
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1) Division of Materials Engineering, Gyeongsang National University & ERI
2) Biosmart Ltd
3) Department of Materials Science and Engineering, Ulsan University
4) Seoul Municipal Boramae Hospital
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Phase transformation behavior, the shape memory characteristics and the superelasticity of Ti–Ni–Cu–Mo alloys have been investigated by means of electrical resistivity measurements, X-ray diffraction, thermal cycling tests under constant load and tensile tests. A fully annealed Ti–44.7Ni–5Cu–0.3Mo alloy transformed in two-stage, i.e., the B2-B19-B19′ on cooling and the B19′-B19-B2 on heating. Fully annealed Ti–39.7Ni–10Cu–0.3Mo, Ti–34.7Ni–15Cu–0.3Mo and Ti–29.7Ni–20Cu–0.3Mo alloys transformed in one-stage on, i.e., from the B2 to the B19 on cooling and from the B19 to B2 on heating. The maximum recoverable elongation deceased from 6.0 to 2.4% with increasing Cu-content from 5 to 20 at%. Transformation hysteresis associated with the B2-B19 transformation decreased from 11 to 5 K with increasing Cu-content from 5 to 20 at%. Substitution of Mo for Ni in Ti–Ni–Cu alloys improved the superelasticity.
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Keyword: titanium-nickel-copper-molybdenum alloys, transformation behavior, shape memory characteristics, superelasticity
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Received: November 19, 2001
Accepted: April 15, 2002 ,
Published online: September 06, 2005 |
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Copyright (c) 2005 The Japan Institute of Metals |
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