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Energy density effect of laser alloyed TiB2/TiC/Al composite coatings on LMZ/HAZ, mechanical and corrosion properties
Ravnikar, Dunja (Avtor), Trdan, Uroš (Avtor), Nagode, Aleš (Avtor), Šturm, Roman (Avtor)

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Izvleček
In the present work, TiC/TiB2/Al composite coatings were synthesized onto a precipitation hardened AlSi1MgMn alloy by laser surface alloying (LSA), using 13.3 J/mm2 and 20 J/mm2 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 TiB2 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, ceramic coatings on Al alloy, microstructure, laser melted/heat affected zone, microhardness, wear, corrosion
Vrsta gradiva:Članek v reviji (dk_c)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
Leto izida:2020
Poslano v recenzijo:17.02.2020
Datum sprejetja članka:18.03.2020
Datum objave članka:23.03.2020
Št. strani:Str. 1-19
Številčenje:Vol. 10, iss. 3
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
Število ogledov:95
Število prenosov:46
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Gradivo je del revije

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

Gradivo je financirano iz projekta

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

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:25.03.2020

Sekundarni jezik

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

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