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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

<a href="/cs/project/GBP108%2F12%2FG043" target="_blank" >GBP108/12/G043: Mikro- a nanokrystalické materiály s vysokým podílem rozhraní pro moderní strukturní aplikace, biodegradabilní implantáty a uchovávání vodíku</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

International Journal of Hydrogen Energy

ISSN

0360-3199

e-ISSN

—

Svazek periodika

42

Číslo periodika v rámci svazku

35

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

22460-22467

Kód UT WoS článku

000411168200025

EID výsledku v databázi Scopus

2-s2.0-85019853163