The Evolution of Defects in Zirconium in the Process of Hydrogen Sorption and Desorption

Abstract:

The influence of hydrogen sorption-desorption cycles on defect structure of Zr-1Nb alloy was investigated. Specimens were hydroganated from gas atmosphere at temperature 500 °C and pressure 2 atm up to the hydrogen concentration equal to 0.05 wt.% for each cycle. The hydrogen concentration during saturation was determinate by the volumetric method. Then samples were annealed at temperature 900 °C with the heating rate of 4 °C/s. The lattice defects were studied by means of positron lifetime spectroscopy (PLS) and doppler broadening spectroscopy (DBS). New experimental data about the evolution of the average positron lifetieme τ_avg, as well as the relative changes in the parameters S, W depending treatment stage in Zr-1Nb alloy during thermo hydrogen proccessing was obtained.

• Periodical: Key Engineering Materials (Volume 683)
• Pages: 256-261
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.683.256
• Online since: February 2016
• Authors: Roman S. Laptev, Andrey M. Lider, Yurii Bordulev, Viktor N. Kudiiarov*, Dmitriy V. Gvozdyakov
• Keywords: Doppler Broadening, Hydrides Formation, Hydrogen Accumulation, Hydrogen Release, Positron Lifetime, Zr-H System

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