Papers by Isao Nakatsugawa
Keikinzoku, Feb 15, 2024
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Journal of Japan Institute of Light Metals, Apr 15, 2023
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Materials transactions, Sep 1, 2020
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Materia, 1999
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軽金属学会大会講演概要, 1998
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Surface & Coatings Technology, Jun 1, 2003
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Journal of Japan Institute of Light Metals, 2017
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Journal of Japan Institute of Light Metals
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MRS Proceedings, 1996
ABSTRACTNiTi shape memory alloy presents interesting mechanical properties as surgical implants. ... more ABSTRACTNiTi shape memory alloy presents interesting mechanical properties as surgical implants. However, due to its high amount of Ni which may dissolve and release toxic ions in human fluids, the medical use of this material is a great concern. We have developed a laser treatment which modifies the oxide layer and enhances uniform and localised corrosion resistance of NiTi alloy.In this paper we further analysed the effect of this treatment with potentiostatic and AC impedance measurements in physiological Hank's solution. We conclude that the laser treatment creates a stable passive film which results in improved corrosion resistance of this alloy.
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JOM, Sep 1, 1995
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MATERIALS TRANSACTIONS
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Journal of Alloys and Compounds
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SSRN Electronic Journal
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Journal of The Electrochemical Society, 2022
The corrosion performance of the AZ91 and AZ91+2%Ca (AZX912) magnesium alloys joined using linear... more The corrosion performance of the AZ91 and AZ91+2%Ca (AZX912) magnesium alloys joined using linear friction welding was investigated. For similar and dissimilar metal combinations – namely AZ91/AZ91, AZX912/AZX912, and AZ91/AZX912, the performance was evaluated by mass loss analysis and the scanning vibrating electrode technique in 1 wt.% NaCl solution. Galvanic behavior between AZ91 and AZX912 was examined by potentiostatic polarization and galvanic current measurements. Approximately 0.3–0.6-mm-thick seamless weld zones were generated in all of the welds, which did not show any appreciable changes in the surface profiles acquired after the corrosion test. The corrosion-induced mass loss rate of the AZ91/AZX912 dissimilar weld was 10% higher than those of the AZ91/AZ91 and AZX912/AZX912 similar welds. The galvanic test indicated that AZ91 and AZX912 were the anodic and cathodic regions, respectively, with a difference in the corrosion potential of 20–30 mV. The corrosion of the AZ91...
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Journal of High Pressure Institute of Japan, 1988
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Solid-state welding offers distinct advantages for joining reactive materials, such as magnesium ... more Solid-state welding offers distinct advantages for joining reactive materials, such as magnesium (Mg) and its alloys. This study investigates the effect of linear friction welding (LFW) on the microstructure and mechanical properties of cast AZ91 (Mg–9Al–1Zn) and AZ91–2Ca alloys, which (to the best knowledge of the authors) has not been reported in the literature. Using the same set of LFW process parameters, similar alloy joints—namely, AZ91/AZ91 and AZ91–2Ca/AZ91–2Ca—were manufactured and found to exhibit integral bonding at the interface without defects, such as porosity, inclusions, and/or cracking. Microstructural examination of the AZ91/AZ91 joint revealed dissolution of the Al-rich second phase in the weld zone, while the Mn containing phases remained and were refined. In the AZ91–2Ca/AZ91–2Ca joint, the weld zone retained Ca- and Mn-rich phases, which were also refined due to the LFW process. In both joint types, extensive recrystallization occurred during LFW, as evidenced ...
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Journal of Alloys and Compounds
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Journal of Japan Institute of Light Metals
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Journal of The Electrochemical Society
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Papers by Isao Nakatsugawa