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논문 기본 정보

자료유형
학술저널
저자정보
S. Buytoz (Firat University) F. Dagdelen (Firat University) I. N. Qader (Firat University) M. Kok (Firat University) B. Tanyildizi (Firat University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.5
발행연도
2021.1
수록면
767 - 778 (12page)

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초록· 키워드

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Improving shape memory alloys in term of microstructural analysis is important for some related applications. In this study,three diff erent NiTiHf shape memory alloys were produced from high pure elements and by utilizing arc-melting device.The morphologies of diff erent precipitations and microstructures were analyzed by optical microscope, mapping, and EDXcompositional analysis. The DSC measurements showed that the phase transformation temperatures is increased by addingmore hafnium instead of nickel content in NiTiHf alloy, however, the enthalpy change for both endo/exothermic processwere decreased. Also, XRD analysis has been carried out for all alloys to fi nd diff erent phases, and to obtain grain size as afunction of diff erent composition of Ni and Hf elements. The oxidation shows that titanium dioxide (TiO 2 ) is spread out overthe surface, but the microstructures are completely diff erent for each case, e.g. needle-like shapes (nanorods) has extendedover the surface of Alloy A with 3 at% Hf, but plate-like Ti-rich microstructures is dominated on the surface of Alloy B thathas twice as more Hf as Alloy A; on the other hand, Alloy C with 9 at% Hf has some precipitates with TiO phase.

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