Preparation of porous TiNi-Ti alloy by diffusion sintering method and study of its composition, structure and martensitic transformations

doi:10.1016/j.jallcom.2021.163559

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DOI Доступ к ресурсу на сайте издателя			10.1016/j.jallcom.2021.163559

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Title: Preparation of porous TiNi-Ti alloy by diffusion sintering method and study of its composition, structure and martensitic transformations
Creator: Anikeev, Sergey G.
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Artyukhova, Nadezhda V.
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Shabalina, Anastasiia V.
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Kulinich, Sergei A.
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Khodorenko, Valentina N.
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Kaftaranova, Maria I.
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Promakhov, Vladimir V.
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Gunther, Victor E.
Date: 2022
DOI: 10.1016/j.jallcom.2021.163559
Description: The study demonstrates a method for controlling not only the phase composition but also the atomic composition of TiNi matrix in porous TiNi-Ti alloys developed for biomedical uses as implants. The alloys were obtained from TiNi powder which was sintered with Ti powder added at as much as 0–10 at%. The structure, phase and chemical composition of the produced TiNi-Ti alloys was investigated with respect to the amount of Ti added into the material. It is shown that in the sintered product containing 5 at% and more of Ti additive, the composition of its TiNi matrix becomes close to equiatomic (with Ti:Ni atomic ratio ~1), and the excessive Ti precipitates as secondary phases Ti2Ni and Ti3Ni4. In parallel, with increase in Ti ad- ditive from 0–10 at%, the structure of the precipitating Ti2Ni type phases changes its morphology from separate spherical or pyramidal precipitates to large dendritic formations. The direct martensitic trans- formation from austenite to martensite in all the samples was found to proceed in two stages and through the R-phase (B2→R→B19′). Thermoresistive analysis demonstrated that TiNi-Ti samples with 5 and more at% of Ti had their characteristic starting temperature of martensite transition stabilizing at ~57 °C (330 K). This implies that the sample with 5 at% of Ti additive exhibited desired martensite transition temperatures, while containing a minimum concentration of secondary-phase precipitates in its matrix which deteriorate its properties. Thus, for the 곙rst time, we show that a very simple preparation approach based on sintering powders of TiNi and Ti is capable of producing porous TiNi-Ti alloys with properties optimized for fabricating bone implants.

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collection(s): Сибирский физико-технический институт | Физический факультет | Научное управление
Identifier: смотреть в электронном каталоге НБ ТГУ
Type: статьи в журналах
Source: Journal of alloys and compounds. 2022. Vol. 900. P. 163559 (1-8)
Language: eng

Created: 10-03-2023

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Сибирский физико-технический институт

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Физический факультет Preparation of porous TiNi-Ti alloy by diffusion sintering method and study of its composition, structure and martensitic transformations