Microstructure and Hydrogen Permeability of Nb-Ni-Ti-Zr-Co High Entropy Alloys
| Parent link: | Membranes Vol. 12, iss. 11.— 2022.— [1157, 9 p.] |
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| সংস্থা লেখক: | |
| অন্যান্য লেখক: | , , , , , |
| সংক্ষিপ্ত: | 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. |
| ভাষা: | ইংরেজি |
| প্রকাশিত: |
2022
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| বিষয়গুলি: | |
| অনলাইন ব্যবহার করুন: | http://earchive.tpu.ru/handle/11683/74795 https://doi.org/10.3390/membranes12111157 |
| বিন্যাস: | বৈদ্যুতিক গ্রন্থের অধ্যায় |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=669061 |
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| 200 | 1 | |a Microstructure and Hydrogen Permeability of Nb-Ni-Ti-Zr-Co High Entropy Alloys |f D. G. Krotkevich, E. B. Kashkarov, M. Koptsev [et al.] | |
| 203 | |a Text |c electronic | ||
| 300 | |a Title screen | ||
| 320 | |a [References: 31 tit.] | ||
| 330 | |a 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. | ||
| 461 | |t Membranes | ||
| 463 | |t Vol. 12, iss. 11 |v [1157, 9 p.] |d 2022 | ||
| 610 | 1 | |a электронный ресурс | |
| 610 | 1 | |a труды учёных ТПУ | |
| 610 | 1 | |a high-entropy alloys | |
| 610 | 1 | |a membranes | |
| 610 | 1 | |a microstructure | |
| 610 | 1 | |a ab initio calculation | |
| 610 | 1 | |a hydrogen permeability | |
| 610 | 1 | |a высокоэнтропийные сплавы | |
| 610 | 1 | |a мембраны | |
| 610 | 1 | |a микроструктура | |
| 610 | 1 | |a водородопроницаемость | |
| 701 | 1 | |a Krotkevich |b D. G. |c physicist |c engineer of Tomsk Polytechnic University |f 1990- |g Dmitry Georgievich |3 (RuTPU)RU\TPU\pers\46798 | |
| 701 | 1 | |a Kashkarov |b E. B. |c Physicist |c Associate Professor, Researcher of Tomsk Polytechnic University, Candidate of Physical and Mathematical Sciences |f 1991- |g Egor Borisovich |3 (RuTPU)RU\TPU\pers\34949 |9 18267 | |
| 701 | 1 | |a Koptsev |b M. |c physicist |c Engineer of Tomsk Polytechnic University |f 1994- |g Maksim |3 (RuTPU)RU\TPU\pers\47505 | |
| 701 | 1 | |a Svyatkin |b L. A. |c physicist |c Associate Professor of Tomsk Polytechnic University, Candidate of Physical and Mathematical Sciences |f 1988- |g Leonid Aleksandrovich |3 (RuTPU)RU\TPU\pers\34216 |9 17747 | |
| 701 | 1 | |a Travitsky (Travitzky) |b N. |c specialist in the field of material science |c Professor of Tomsk Polytechnic University |f 1951- |g Nakhum |3 (RuTPU)RU\TPU\pers\42461 | |
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| 712 | 0 | 2 | |a Национальный исследовательский Томский политехнический университет |b Инженерная школа ядерных технологий |b Отделение экспериментальной физики |3 (RuTPU)RU\TPU\col\23549 |
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| 856 | 4 | |u http://earchive.tpu.ru/handle/11683/74795 | |
| 856 | 4 | |u https://doi.org/10.3390/membranes12111157 | |
| 942 | |c CF | ||