TiC reinforced composite layer formation on Al–Si alloy by laser processing

Abstract

Al-Si alloy was laser surface treated with various compositions of TiC and Ni under different laser processing parameters to produce a TiC reinforced composite layer on it. The study shows that TiC composite layer is formed when the composition is 75TiC-25Ni (wt-%) and laser power 2 . 5 kW and scan speed 0 . 2 m min 21 . The layer exhibited an average microhardness of y750 HV, which is free from pores as well as cracks and contained TiC and Al-Si phases distributed in the Ni-Al matrix. Mechanical strength of layer is studied by the hardness test.

Laser generated TiC reinforced with Fe-Al matrix composite layer on Al-Si alloy

“…In the previous study 4 TiC was reinforced with Ni-Al intermettalic on Al-Si alloy. The study showed that, though the TiC was well bounded with Ni-Al intermetalics, the clad layer exhibited inconsistence of hardness distribution due to soft nature of Ni-Al intermetallics.…”

“…Laser surface engineering provides several unique surface properties as compared to the conventional methods. Processability of the materials using laser involves rapid heating and subsequent cooling, these results in non-equilibrium phase formation and also a strong bond between the layer and substrate 4 .…”

“…TiC is widely used as a reinforced phases on various traditional substrate materials (Al alloys, steel and Ti alloys) 4,12,13 as it has high hardness, modulus and high flexural strength. Fe generally is used as metal matrix which acts as a binding matrix with TiC due to its nature of high thermal stability while forming Fe-Al intermetalics compounds during laser processing [13][14][15] .…”

Laser ablation of phosphor bronze for superhydrophobic surface

“…Laser melt injection of WC particles on aluminium surface was studied by Li et al 14 They demonstrated that the powder should be fed from the back side of the laser beam to achieve appropriate surface enhancement effect and the depth of the melt layer increased first and, then, decreased with increasing laser power. Laser processing of TiC reinforced composite layer on Al–Si alloy surface was investigated by Viswanathan et al 15 The findings revealed that the layer was free from pores and TiC and Al–Si phases were almost uniformly distributed in the Ni–Al matrix. Laser ablation of archaeological bronze plate surface underwater was investigated by Dajnowski.…”

Enhancement of corrosion resistance of nickel based superalloys by laser surface melting

“…It is one of the important groups of surface engineering tools because of their characteristic features, such as rapid heating and melting, which facilitate the possibility of extended solid solution, fine microstructure, composition homogenisation, excellent metallurgical interface, etc. [3][4][5][6] Additionally, the other advantages of LSM over conventional processes are short processing time, flexibility in operation, economy in time, energy, material consumption. etc.…”