Evolution of microstructure in laser surface alloying of aluminium with nickel
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Formation of Ni-rich aluminide layers on an A356 aluminum alloy by a combined electroplating/laser alloying treatment: Microstructure and tribological characteristics
2017, Journal of Manufacturing ProcessesCitation Excerpt :It has been reported that the main factor for distributing of alloying elements in the molten pool is the existence of a strong convection current during laser alloying treatment. This factor derives from thermo-capillary motion thanks to the difference in surface tension of liquid metal between the center and the edge of the molten pool [15]. According to the Al-Ni phase diagram [16] and nickel content of alloyed layers, Al3Ni and Al3Ni2 intermetallics were the main probable phases which might be found in layers.
Low power CO<inf>2</inf> laser modified iron/nickel alloyed pure aluminum surface: Evaluation of structural and mechanical properties
2017, Surface and Coatings TechnologyCitation Excerpt :In the process of laser surface alloying, the selection of the alloying elements, compositional ratio, and elemental surface distribution play paramount role towards the development of microstructure in the alloyed layer. For laser surface alloying with high power laser, it is demonstrated that the distribution of the alloying elements in the alloyed layer remains reasonably uniform if the layer thickness is small (approximately 400 mm) [40,14]. So far, no conclusive remark is made regarding surface layer distribution for alloying using low power laser.
Surface modification of aluminium by graphene impregnation
2017, Materials and DesignCitation Excerpt :Though the mechanical properties of pure aluminium can be improved by incorporating alloying elements like copper, nickel or zinc, the alloying results in low hardness and low melting point leading to poor tribological properties and heat resistance [1–2]. Keeping this point in view, several researchers have applied different methods like electroless plating [3–5], laser treatment and plasma spraying [2,6], laser surface alloying [7–9], laser shock peening [10–11], sol-gel technique [12], nitrogen implantation [13–14] etc. to improve the surface, subsurface and bulk properties of various aluminium alloys. Surface modification of aluminium has also been done by carbon implantation [15–17], where carbon gets implanted up to a depth of 150 nm with formation of aluminium carbide.
Investigating the surface properties of EN-31 die-steel after machining with powder metallurgy EDM electrodes
2017, Materials Today: ProceedingsEffect of pulse laser parameters on TiC reinforced AISI 304 stainless steel composite coating by laser surface engineering process
2015, Optics and Lasers in EngineeringCitation Excerpt :Less number of studies about surface modification by laser alloying or laser cladding process using pulse laser have been reported so far. Das et al. [8] investigated the surface alloying of commercially pure aluminium with nickel using a pulsed Nd:YAG laser. It was observed that, distribution of the alloying element in the alloyed layer is uniform for a relatively low initial layer thickness.
Laser alloyed Al-W coatings on aluminum for enhanced corrosion resistance
2015, Applied Surface ScienceCitation Excerpt :These parameters play an important role in evolution of the intermetallics during LSA. In addition, the convective currents in the melt pool, during LSA also likely to greatly influence these parameters and formation and distribution of the intermetallic phases [44]. The formation of such phases on the alloyed surface is likely to exert substantial influence on corrosion performance which is discussed in the following section.