Energy density effect of laser alloyed TiB$_2$/TiC/Al composite coatings on LMZ/HAZ, mechanical and corrosion properties

Ravnikar, Dunja (avtor), Trdan, Uroš (avtor), Nagode, Aleš (avtor), Šturm, Roman (avtor)

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
• UDK: 620.1/.2:621.7+621.9(045)
• ISSN pri članku: 2075-4701
• DOI: 10.3390/met10030411
• COBISS.SI-ID: 17102363
• Datum objave v RUL: 01.06.2021

Gradivo je del revije

• Naslov: Metals
• Skrajšan naslov: Metals
• Založnik: MDPI AG
• ISSN: 2075-4701
• COBISS.SI-ID: 15976214

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