Structure and Phase State of Ti49.4Ni50.6 (at%) Hydrogenated in Normal Saline

The paper analyzes the surface structure and phase state of Ti49.4Ni50.6 (at%) hydrogenated at 295 K in normal saline (0.9% NaCl aqueous solution with pH = 5.7) at 20 A/m2 for 0.5–6 h. The analysis shows that the average hydrogen c...

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Autores principales:	Victor Grishkov, Aleksandr Lotkov, Dorzhima Zhapova, Yuri Mironov, Victor Timkin, Elena Barmina, Olga Kashina
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Ti<sub>49.4</sub>Ni<sub>50.6</sub> (at%) alloy hydrogen electrolytic hydrogenation hydride structure Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/20b1a216a0e24429be08446a7177c9f1
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spelling	oai:doaj.org-article:20b1a216a0e24429be08446a7177c9f12021-11-25T18:15:56ZStructure and Phase State of Ti<sub>49.4</sub>Ni<sub>50.6</sub> (at%) Hydrogenated in Normal Saline10.3390/ma142270461996-1944https://doaj.org/article/20b1a216a0e24429be08446a7177c9f12021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/7046https://doaj.org/toc/1996-1944The paper analyzes the surface structure and phase state of Ti<sub>49.4</sub>Ni<sub>50.6</sub> (at%) hydrogenated at 295 K in normal saline (0.9% NaCl aqueous solution with pH = 5.7) at 20 A/m<sup>2</sup> for 0.5–6 h. The analysis shows that the average hydrogen concentration in the alloy increases with the hydrogenation time t<sub>H</sub> as follows: slowly to 50 ppm at t<sub>H</sub> = 0.5–1.5 h, steeply to 150 ppm at t<sub>H</sub> = 1.2–2 h, and linearly to 300 ppm at t<sub>H</sub> = 2–6 h. According to Bragg–Brentano X-ray diffraction data (θ–2 θ, 2 θ ≤ 50°, CoKα radiation), the alloy in its scanned surface layer of thickness ~5.6 µm reveals a TiNiH<sub>x</sub> phase with x = 0.64 and x = 0.54 after hydrogenation for 4 and 6 h, respectively. The structure of this phase is identifiable as an orthorhombic hydride similar to β<sub>1</sub>–TiFeH<sub>0.94</sub> (space group Pmcm), rather than as a tetragonal TiNiH<sub>x</sub> hydride with x = 0.30–1.0 (space group I4/mmm). Time curves are presented to trace the lattice parameters and volume change during the formation of such an orthorhombic phase from the initial cubic B2 phase in Ti<sub>49.4</sub>Ni<sub>50.6</sub> (at%).Victor GrishkovAleksandr LotkovDorzhima ZhapovaYuri MironovVictor TimkinElena BarminaOlga KashinaMDPI AGarticleTi<sub>49.4</sub>Ni<sub>50.6</sub> (at%) alloyhydrogenelectrolytic hydrogenationhydride structureTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 7046, p 7046 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Ti<sub>49.4</sub>Ni<sub>50.6</sub> (at%) alloy hydrogen electrolytic hydrogenation hydride structure Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	Ti<sub>49.4</sub>Ni<sub>50.6</sub> (at%) alloy hydrogen electrolytic hydrogenation hydride structure Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Victor Grishkov Aleksandr Lotkov Dorzhima Zhapova Yuri Mironov Victor Timkin Elena Barmina Olga Kashina Structure and Phase State of Ti<sub>49.4</sub>Ni<sub>50.6</sub> (at%) Hydrogenated in Normal Saline
description	The paper analyzes the surface structure and phase state of Ti<sub>49.4</sub>Ni<sub>50.6</sub> (at%) hydrogenated at 295 K in normal saline (0.9% NaCl aqueous solution with pH = 5.7) at 20 A/m<sup>2</sup> for 0.5–6 h. The analysis shows that the average hydrogen concentration in the alloy increases with the hydrogenation time t<sub>H</sub> as follows: slowly to 50 ppm at t<sub>H</sub> = 0.5–1.5 h, steeply to 150 ppm at t<sub>H</sub> = 1.2–2 h, and linearly to 300 ppm at t<sub>H</sub> = 2–6 h. According to Bragg–Brentano X-ray diffraction data (θ–2 θ, 2 θ ≤ 50°, CoKα radiation), the alloy in its scanned surface layer of thickness ~5.6 µm reveals a TiNiH<sub>x</sub> phase with x = 0.64 and x = 0.54 after hydrogenation for 4 and 6 h, respectively. The structure of this phase is identifiable as an orthorhombic hydride similar to β<sub>1</sub>–TiFeH<sub>0.94</sub> (space group Pmcm), rather than as a tetragonal TiNiH<sub>x</sub> hydride with x = 0.30–1.0 (space group I4/mmm). Time curves are presented to trace the lattice parameters and volume change during the formation of such an orthorhombic phase from the initial cubic B2 phase in Ti<sub>49.4</sub>Ni<sub>50.6</sub> (at%).
format	article
author	Victor Grishkov Aleksandr Lotkov Dorzhima Zhapova Yuri Mironov Victor Timkin Elena Barmina Olga Kashina
author_facet	Victor Grishkov Aleksandr Lotkov Dorzhima Zhapova Yuri Mironov Victor Timkin Elena Barmina Olga Kashina
author_sort	Victor Grishkov
title	Structure and Phase State of Ti<sub>49.4</sub>Ni<sub>50.6</sub> (at%) Hydrogenated in Normal Saline
title_short	Structure and Phase State of Ti<sub>49.4</sub>Ni<sub>50.6</sub> (at%) Hydrogenated in Normal Saline
title_full	Structure and Phase State of Ti<sub>49.4</sub>Ni<sub>50.6</sub> (at%) Hydrogenated in Normal Saline
title_fullStr	Structure and Phase State of Ti<sub>49.4</sub>Ni<sub>50.6</sub> (at%) Hydrogenated in Normal Saline
title_full_unstemmed	Structure and Phase State of Ti<sub>49.4</sub>Ni<sub>50.6</sub> (at%) Hydrogenated in Normal Saline
title_sort	structure and phase state of ti<sub>49.4</sub>ni<sub>50.6</sub> (at%) hydrogenated in normal saline
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/20b1a216a0e24429be08446a7177c9f1
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Structure and Phase State of Ti<sub>49.4</sub>Ni<sub>50.6</sub> (at%) Hydrogenated in Normal Saline

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