Characterization of Lattice Defects in Refractory Metal High-Entropy Alloy HfNbTaTiZr by Means of Positron Annihilation Spectroscopy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10456297" target="_blank" >RIV/00216208:11320/22:10456297 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=t7hDwlF2Uu" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=t7hDwlF2Uu</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/pssa.202100840" target="_blank" >10.1002/pssa.202100840</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Characterization of Lattice Defects in Refractory Metal High-Entropy Alloy HfNbTaTiZr by Means of Positron Annihilation Spectroscopy

Popis výsledku v původním jazyce

Lattice defects in refractory metal high-entropy alloy HfNbTaTiZr are investigated using positron lifetime spectroscopy combined with coincidence Doppler broadening (CDB) spectroscopy. Annealing of HfNbTaTiZr alloy at 1000 degrees C results in full recovery of defects and formation of single-phase random solid solution characterized by the bulk positron lifetime of 141 ps. This value is in accordance with the theoretical estimation. Quenching of the alloy from high temperature prevents recovery of thermally equilibrium vacancies and enables to retain a high concentration of vacancies in the sample at ambient temperature. For single vacancies in the HfNbTaTiZr alloy, a characteristic positron lifetime of 212 ps is measured, which is significantly shorter than the value estimated by theoretical calculations. It indicates that there is considerable ion relaxation around vacancies. The CDB spectroscopy investigations reveal that vacancies in HfNbTaTiZr alloy are not distributed randomly but are preferentially coupled with Hf solutes.

Název v anglickém jazyce

Characterization of Lattice Defects in Refractory Metal High-Entropy Alloy HfNbTaTiZr by Means of Positron Annihilation Spectroscopy

Popis výsledku anglicky

Lattice defects in refractory metal high-entropy alloy HfNbTaTiZr are investigated using positron lifetime spectroscopy combined with coincidence Doppler broadening (CDB) spectroscopy. Annealing of HfNbTaTiZr alloy at 1000 degrees C results in full recovery of defects and formation of single-phase random solid solution characterized by the bulk positron lifetime of 141 ps. This value is in accordance with the theoretical estimation. Quenching of the alloy from high temperature prevents recovery of thermally equilibrium vacancies and enables to retain a high concentration of vacancies in the sample at ambient temperature. For single vacancies in the HfNbTaTiZr alloy, a characteristic positron lifetime of 212 ps is measured, which is significantly shorter than the value estimated by theoretical calculations. It indicates that there is considerable ion relaxation around vacancies. The CDB spectroscopy investigations reveal that vacancies in HfNbTaTiZr alloy are not distributed randomly but are preferentially coupled with Hf solutes.

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/GA21-16218S" target="_blank" >GA21-16218S: Absorpce a desorpce vodíku ve slitinách přechodových kovů s vysokou entropií s kubickou prostorově centrovanou strukturou</a><br>

Návaznosti

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

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Physica Status Solidi (A) Applications and Materials

ISSN

1862-6300

e-ISSN

1862-6319

Svazek periodika

219

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

8

Strana od-do

2100840

Kód UT WoS článku

000770997400001

EID výsledku v databázi Scopus

2-s2.0-85126775152