izpis_h1_title_alt

Energy density effect of laser alloyed TiB$_2$/TiC/Al composite coatings on LMZ/HAZ, mechanical and corrosion properties
ID Ravnikar, Dunja (Avtor), ID Trdan, Uroš (Avtor), ID Nagode, Aleš (Avtor), ID Šturm, Roman (Avtor)

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Izvleček
In the present work, TiC/TiB$_2$/Al composite coatings were synthesized onto a precipitation hardened AlSi1MgMn alloy by laser surface alloying (LSA), using 13.3 J/mm$^2$ and 20 J/mm$^2$ laser energy densities. Microstructure evaluation, microhardness, wear and corrosion performance were investigated and compared with the untreated/substrate Al alloy sample. The results confirmed sound, compact, crackles composite coating of low porosity, with a proper surface/substrate interface. Microstructural analyses revealed the formation of extremely fine nano-precipitates, ranging from of 50–250 nm in the laser melted (LMZ) and large precipitates, accompanied with grain coarsening in the heat-affected zone (HAZ), due to the substrate overheating during the LSA process. Nonetheless, both coatings achieved higher microhardness, with almost 7-times higher wear resistance than the untreated sample as a consequence of high fraction volume of hard, wear resistant TiB$_2$ and TiC phases inside the composite coatings. Further, cyclic polarization results in 0.5 M NaCl aqueous solution confirmed general improvement of corrosion resistance after LSA processed samples, with reduced corrosion current by more than a factor of 9, enhanced passivation/repassivation ability and complete prohibition of crystallographic pitting, which was detected with the untreated Al alloy.

Jezik:Angleški jezik
Ključne besede:laser surface alloying (LSA), ceramic coatings on Al alloy, microstructure, laser melted/heat affected zone (LMZ/HAZ), microhardness, wear, corrosion
Vrsta gradiva:Članek v reviji
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
NTF - Naravoslovnotehniška fakulteta
Status publikacije:Objavljeno
Različica publikacije:Objavljena publikacija
Leto izida:2020
Št. strani:19 str.
Številčenje:Vol. 10, iss. 3, art. 411
PID:20.500.12556/RUL-127266 Povezava se odpre v novem oknu
UDK:620.1/.2:621.7+621.9(045)
ISSN pri članku:2075-4701
DOI:10.3390/met10030411 Povezava se odpre v novem oknu
COBISS.SI-ID:17102363 Povezava se odpre v novem oknu
Datum objave v RUL:01.06.2021
Število ogledov:833
Število prenosov:179
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Gradivo je del revije

Naslov:Metals
Skrajšan naslov:Metals
Založnik:MDPI AG
ISSN:2075-4701
COBISS.SI-ID:15976214 Povezava se odpre v novem oknu

Licence

Licenca:CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by/4.0/deed.sl
Opis:To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
Začetek licenciranja:23.03.2020

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:lasersko legiranje površine, keramične prevleke, aluminijeve zlitine, mikrostruktura, mikrotrdota, obraba, korozija

Projekti

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:P2-0270
Naslov:Proizvodni sistemi, laserske tehnologije in spajanje materialov

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