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

Result code in 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>
Alternative codes found
RIV/00216208:11320/25:10507891 RIV/68407700:21220/25:00390132 RIV/00216305:26210/26:0200539
Result on the web
<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>

Result language
angličtina
Original language name
Characterizing Deformation by Positron Annihilation Spectroscopy: Cold Spray Versus High-Pressure Torsion
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
20501 - Materials engineering

Project
<a href="/en/project/GA22-14048S" target="_blank" >GA22-14048S: Microstructure development and multiplication of lattice defects in cold spray additive manufacturing</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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