Coatings containing nickel aluminide were fabricated on Al alloy 2024 by laser alloying with pure Ni powder. Microstructure images illustrated that the coatings are free from cracks and pores and metallurgically bonded to substrate. Test results showed that the coatings have a microhardness of about 600 HV0·2 and the wear resistance is four times higher than that of the substrate. Laser processing parameters, especially power output and scanning speed, affect coating's quality significantly. Qualified coatings can be produced with a set of parameters of power output of 800 W, scanning speed of 8 mm s−1, beam size of 1·5 mm and overlap rate of 30%.
GordaniGR, ShojaRazaviR, HashemiSH, IsfahaniAR: ‘Laser surface alloying of an electroless Ni–P coating with Al-356 substrate’, Opt. Lasers Eng., 2008, 46, 550–557.
2.
RyanP, PrangnellPB: ‘Grain structure and homogeneity of pulsed laser treated surfaces on Al-aerospace alloys and FSWs’, Mater. Sci. Eng. A, 2008, A479, 65–75.
3.
ManHC, ZhangS, YueTM, ChengFT: ‘Laser surface alloying of NiCrSiB on Al6061 aluminum alloy’, Surf. Coat. Technol., 2001, 148, 136–142.
4.
LiangGY, WongTT: ‘Microstructure and character of laser remelting of plasma sprayed coating (Ni–Cr–B–Si) on Al–S1 alloy’, Surf. Coat. Technol., 1997, 89, 121–126.
5.
ManHC, KwokCT, YueTM: ‘Cavitation erosion and corrosion behaviour of laser surface alloyed MMC of SiC and Si3N4 on Al alloy AA6061’, Surf. Coat. Technol., 2000, 132, 11–20.
6.
KadolkarP, DahotreNB: ‘Effect of processing parameters on the cohesive strength of laser surface engineered ceramic coatings on aluminum alloys’, Mater. Sci. Eng. A, 2003, A342, 183–191.
7.
FariautF, Boulmer-LeborgneC, Le MennE, SauvageT, AndreazzaC, AndreazzaP, LangladeC: ‘Surface carburization of aluminum alloys by excimer laser’, Surf. Coat. Technol., 2001, 146–147, 324–330.
8.
XuJ, LiuW: ‘Wear characteristic of in situ synthetic TiB2 particulate-reinforced Al matrix composite formed by laser cladding’, Wear, 2006, 260, 486–492.
NovoselovaT, CelottoS, MorganR, FoxP, O'NeillW: ‘Formation of TiAl intermetallics by heat treatment of cold-sprayed precursor deposits’, J. Alloys Compd, 2007, 436, 69–77.
