In-situ characterization of hydrogen-induced defects in palladium by positron annihilation and acoustic emission

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10367768" target="_blank" >RIV/00216208:11320/17:10367768 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/j.ijhydene.2017.04.275" target="_blank" >http://dx.doi.org/10.1016/j.ijhydene.2017.04.275</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijhydene.2017.04.275" target="_blank" >10.1016/j.ijhydene.2017.04.275</a>

Result language

angličtina

Original language name

In-situ characterization of hydrogen-induced defects in palladium by positron annihilation and acoustic emission

Original language description

Positron annihilation spectroscopy was employed for characterization of hydrogen induced defects in Pd. Positron annihilation studies were performed in-situ during electrochemical hydrogen charging and were combined with measurement of acoustic emission, which is a non-destructive technique capable of monitoring of collective dislocation motion. It was found that hydrogen loading introduced defects into Pd lattice, namely vacancies and dislocations. At low concentrations (alpha-phase) hydrogen loading created vacancies associated with hydrogen. Stresses induced by growing a&apos;-phase particles led to plastic deformation and introduced dislocations into the sample. Moreover, additional vacancies were introduced into the sample by crossing dislocations. Vickers hardness testing revealed that hydrogen absorbed in interstitial sites causes solid solution hardening. Further hardening was caused by dislocations when a&apos;-phase particles are formed. Pd sample completely transformed into the alpha&apos;-phase was subsequently unloaded. Decomposition of alpha&apos;-phase particles during unloading caused further increase of dislocation density and led to an additional hardening. Loading-unloading of Pd sample with hydrogen continuously generates dislocations and makes the sample harder.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

<a href="/en/project/GBP108%2F12%2FG043" target="_blank" >GBP108/12/G043: Interface controlled properties of micro/nanocrystalline materials for advanced structural applications, biodegradable implants and hydrogen storage</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

International Journal of Hydrogen Energy

ISSN

0360-3199

e-ISSN

—

Volume of the periodical

42

Issue of the periodical within the volume

35

Country of publishing house

GB - UNITED KINGDOM

Number of pages

8

Pages from-to

22460-22467

UT code for WoS article

000411168200025

EID of the result in the Scopus database

2-s2.0-85019853163