Phase Transformation Control of Powder Metallurgy Super-elastic Ti-Ni Alloy by Adding Co Element
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Author list: Eda T., Khantachawana A., Umeda J., Kondoh K.
Publisher: Journal of the Japan Society of Powder and Powder Metallurgy
Publication year: 2019
Volume number: 66
Issue number: 1
Start page: 9
End page: 16
Number of pages: 8
ISSN: 0532-8799
eISSN: 0532-8799
Languages: Japanese (JA)
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Abstract
In order to improve the controllability of the mechanical properties of powder metallurgy (PM) titanium (Ti) -nickel (Ni) super-elastic alloys, cobalt (Co) powder was added to the alloys up to 2.0 at.%. In particular, the dependence of plateau stress and recovery rate in tensile hysteresis test on Co content was investigated by considering microstructures analysis results. XRD and TEM-EDS analysis clarified Co elements existed as substitutional solution atoms in Ni atom sites of Ti-Ni alloys. It was confirmed that PM Ti-Ni-Co alloys with the Co content of 1.0 at.% Co or less showed a high shape recovery rate of around 90% or more. In addition, the increment of the plateau stress of Ti-Ni-Co alloys was almost constant regardless of the holding time in heat treatment. That is, the Co solution content had no effect on the amount and morphological size of Ti 3 Ni 4 precipitates. Therefore, it was possible to independently control the plateau stress without affecting sliding critical strain by adding Co element to Ti-Ni alloys. ฉ2019 Japan Society of Powder and Powder Metallurgy
Keywords
Shape memory property, Super-elastic, Titanium-nickel-cobalt alloy
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