Characterizing Deformation by Positron Annihilation Spectroscopy: Cold Spray Versus High-Pressure Torsion

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F25%3A00646439" target="_blank" >RIV/61389021:_____/25:00646439 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/25:10507891 RIV/68407700:21220/25:00390132 RIV/00216305:26210/26:0200539

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s11666-025-02031-2" target="_blank" >https://link.springer.com/article/10.1007/s11666-025-02031-2</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11666-025-02031-2" target="_blank" >10.1007/s11666-025-02031-2</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Characterizing Deformation by Positron Annihilation Spectroscopy: Cold Spray Versus High-Pressure Torsion

Popis výsledku v původním jazyce

Cold spray (CS) is a progressive method for the deposition of metals and alloys whose principles involve considerable plastic deformation of the produced material at extreme strain rates. Positron annihilation spectroscopy (PAS) is an analytical technique capable of studying deformation on the atomic scale level, even in extremely deformed materials. In our study, the PAS method was used to characterize the microstructure and quantify the open-volume defects in four cold sprayed metals: Al, Cu, Ni, and Ti. As counterparts, bulk samples of these materials with ultra-fine-grained structures were also produced by high-pressure torsion (HPT), a process exceeding cold spray in the total deformation, but having several orders of magnitude smaller strain rates, and by a traditional cold rolling process. The results show that the CS and HPT processes lead to the formation of similar lattice defects (dislocations and vacancy clusters), and both exhibit significantly higher dislocation densities than conventionally cold-rolled materials. Further, the vacancy clusters present in CS and HPT materials were not present in the rolled counterparts due to the lower vacancy production rate.

Název v anglickém jazyce

Characterizing Deformation by Positron Annihilation Spectroscopy: Cold Spray Versus High-Pressure Torsion

Popis výsledku anglicky

Cold spray (CS) is a progressive method for the deposition of metals and alloys whose principles involve considerable plastic deformation of the produced material at extreme strain rates. Positron annihilation spectroscopy (PAS) is an analytical technique capable of studying deformation on the atomic scale level, even in extremely deformed materials. In our study, the PAS method was used to characterize the microstructure and quantify the open-volume defects in four cold sprayed metals: Al, Cu, Ni, and Ti. As counterparts, bulk samples of these materials with ultra-fine-grained structures were also produced by high-pressure torsion (HPT), a process exceeding cold spray in the total deformation, but having several orders of magnitude smaller strain rates, and by a traditional cold rolling process. The results show that the CS and HPT processes lead to the formation of similar lattice defects (dislocations and vacancy clusters), and both exhibit significantly higher dislocation densities than conventionally cold-rolled materials. Further, the vacancy clusters present in CS and HPT materials were not present in the rolled counterparts due to the lower vacancy production rate.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GA22-14048S" target="_blank" >GA22-14048S: Vývoj mikrostruktury a multiplikace poruch krystalické mřížky při kinetickém nanášení</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Journal of Thermal Spray Technology

ISSN

1059-9630

e-ISSN

1544-1016

Svazek periodika

34

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

10

Strana od-do

2710-2719

Kód UT WoS článku

001594731600019

EID výsledku v databázi Scopus

2-s2.0-105013575527