Laser alloying with Fe–B4C–Ti on AA6061 for improved wear resistance. (2nd December 2021)

• Record Type: Journal Article
• Authors: Chi, Yiming; Meng, Xiaoxi; Dou, Jinhe; Yu, Huijun; Chen, Chuanzhong
• Is Part Of: Surface engineering. Volume 37:Number 12(2021)
• Page Start: 1503
• Page End: 1513
• Publication Date: 2021-12-02
• Subjects: Laser alloying -- aluminium -- Fe-based composite coatings -- microstructure -- TiB2 -- hardness -- residual stress -- wear; Surfaces (Technology) -- Periodicals; Coatings -- Periodicals; 620.4405
• DOI: 10.1080/02670844.2021.1916862
• Languages: English
• ISSNs: 0267-0844

Abstract

ABSTRACT: To improve the wear resistance of AA6061 aluminium alloy, Fe-based composite coatings were prepared by laser surface alloying with Fe–B4 C or Fe–B4 C–Ti mixed powders. Microstructures, phase compositions and wear properties were investigated. The results indicated that the coating fabricated with Fe–B4 C was mainly composed of FeAl, Fe3 Al, Fe4 Al13, CrB, Cr2 B, Cr23 C6, Al4 C3, (Fe, Cr) and α -Al phases. When adding Ti in the precursor powders, TiB2 and TiC were also well detected. In-situ synthesised TiB2 particles dispersed on the matrix in a hexagonal platelike structure or closely agglomerated and connected with each other to form a whole. The formation mechanism of TiB2 in different morphologies was further discussed. Compared with the 6061 Al substrate, the micro-hardness of the alloyed coatings was improved to 5.7–6.5 times. With the addition of Ti, the wear volume loss reduced to 10% of that of the substrate, indicating a significant improvement in wear resistance.