Microstructure and Hydrogen Permeability of Nb-Ni-Ti-Zr-Co High Entropy Alloys; Membranes; Vol. 12, iss. 11

Microstructure and Hydrogen Permeability of Nb-Ni-Ti-Zr-Co High Entropy Alloys; Membranes; Vol. 12, iss. 11

書目詳細資料
Parent link:Membranes
Vol. 12, iss. 11.— 2022.— [1157, 9 p.]
企業作者: Национальный исследовательский Томский политехнический университет Инженерная школа ядерных технологий Отделение экспериментальной физики
其他作者: Krotkevich D. G. Dmitry Georgievich, Kashkarov E. B. Egor Borisovich, Koptsev M. Maksim, Svyatkin L. A. Leonid Aleksandrovich, Travitsky (Travitzky) N. Nakhum, Lider A. M. Andrey Markovich
總結:Title screen
Hydrogen separation membranes are one of the most promising technologies for hydrogen purification. The development of high-entropy alloys (HEAs) for hydrogen separation membranes is driven by a “cocktail effect” of elements with different hydrogen affinities to prevent hydride formation and retain high permeability due to the single-phase BCC structure. In this paper, equimolar and non-equimolar Nb-Ni-Ti-Zr-Co high entropy alloys were fabricated by arc melting. The microstructure and phase composition of the alloys were analyzed by scanning electron microscopy and X-ray diffraction, respectively. The hydrogen permeation experiments were performed at 300–500 °C and a hydrogen pressure of 4 bar. In order to estimate the effect of composition and lattice structure on hydrogen location and diffusivity in Nb-Ni-Ti-Zr-Co alloy, ab initio calculations of hydrogen binding energy were performed using virtual crystal approximation. It was found that Nb-enriched and near equimolar BCC phases were formed in Nb20Ni20Ti20Zr20Co20 HEA while Nb-enriched BCC and B2-Ni(Ti, Zr) were formed in Nb40Ni25Ti18Zr12Co5 alloy. Hydrogen permeability tests showed that Nb20Ni20Ti20Zr20Co20 HEA shows lower activation energy and higher permeability at lower temperatures as well as higher resistance to hydrogen embrittlement compared to Nb40Ni25Ti18Zr12Co5 alloy. The effect of composition, microstructure and hydrogen binding energies on permeability of the fabricated alloys was discussed.
語言:英语
出版: 2022
主題:
электронный ресурс
труды учёных ТПУ
high-entropy alloys
membranes
microstructure
ab initio calculation
hydrogen permeability
высокоэнтропийные сплавы
мембраны
микроструктура
водородопроницаемость
在線閱讀:http://earchive.tpu.ru/handle/11683/74795
https://doi.org/10.3390/membranes12111157
格式: 電子 Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=669061

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