Open AccessStudy of hydrogen redistribution in Ti49.1Ni50.9 alloy (at %) with nanocrystalline structure by resistometric and durometer methods
Author(s) -
А. А. Батурин,
А. И. Лотков,
В. Н. Гришков,
Ivan Rodionov
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1347/1/012125
Subject(s) - nanocrystalline material , materials science , alloy , hydrogen , indentation hardness , grain boundary , diffusion , metallurgy , redistribution (election) , grain boundary diffusion coefficient , thermodynamics , microstructure , chemistry , nanotechnology , physics , organic chemistry , politics , political science , law
The electrolytical hydrogenation of TiNi-based alloys with shape memory and super elasticity results in a significant (by 1,5 times) increase in the microhardness of the surface layer. It is shown that the change of microhardness at long-term aging at room temperature in wire samples of Ti 50,1 Ni 50,9 (at %) alloy with nanocrystalline structure can be used for estimation of diffusion mobility of hydrogen. On wire samples with different diameters it is shown that the increase in the relative electrical resistance at 83K at long-term aging at room temperature for this alloy is also associated with the diffusion mobility of hydrogen. Estimates of the hydrogen diffusion coefficient D H show that in nanocrystalline samples Ti 50,1 Ni 50,9 (at %) the diffusion mobility of hydrogen is higher than in coarse-grained samples. This is connected with the increased contribution of grain boundary hydrogen diffusion in samples with nanocrystalline structure.