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

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Abstract
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.

Language:English
Keywords:laser surface alloying (LSA), ceramic coatings on Al alloy, microstructure, laser melted/heat affected zone (LMZ/HAZ), microhardness, wear, corrosion
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
NTF - Faculty of Natural Sciences and Engineering
Publication status:Published
Publication version:Version of Record
Year:2020
Number of pages:19 str.
Numbering:Vol. 10, iss. 3, art. 411
PID:20.500.12556/RUL-127266 This link opens in a new window
UDC:620.1/.2:621.7+621.9(045)
ISSN on article:2075-4701
DOI:10.3390/met10030411 This link opens in a new window
COBISS.SI-ID:17102363 This link opens in a new window
Publication date in RUL:01.06.2021
Views:681
Downloads:172
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Record is a part of a journal

Title:Metals
Shortened title:Metals
Publisher:MDPI AG
ISSN:2075-4701
COBISS.SI-ID:15976214 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:23.03.2020

Secondary language

Language:Slovenian
Keywords:lasersko legiranje površine, keramične prevleke, aluminijeve zlitine, mikrostruktura, mikrotrdota, obraba, korozija

Projects

Funder:ARRS - Slovenian Research Agency
Project number:P2-0270
Name:Proizvodni sistemi, laserske tehnologije in spajanje materialov

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