Experimental investigation of microstructure and surface heat treatment of pure aluminium alloy material

Abstract

In this research work, the Severe Double-Shot Peening (SDSP) and newlineTiAlCr/AlCrSi plasma spray coating was performed on the commercial newlinestructural fabrication materials (Aluminium alloy) to improve the newlinemicrostructure and surface properties and the results are discussed in detail. newlineThe materials were adapted to the shot peening process after which newlinecompressive residual stress and micro strain were formed in the outer surface newlineregion as a grain size measurement of 25 µm was observed. The oxygen newlinereduction for Plasma spray TiAlCr/AlCrSi coating was carried out on the base newlinematerials and Al-Ti eutectic solid phase was directly converted in to twin newlineboundaries and Al lattice structure. Oxidation of micrographs revealed the newlinefine grains boundaries, and#945; delta phase, porous titania (TiO2) surface and newlinelowered the surface roughness. Further, higher hardness value was the newlineoxidation sample when compared to base materials without the process. The newlinehardness was augmented by 36%. Tensile results of SDSP and TiAlCr/AlCrSi newlinecoating on the base material whose ultimate strength were of 389 MPa and newline420 MPa, 437 MPa respectively. AlO2 surface with multiple bonding structure newlinemainly contributed to the tensile strength of the samples. Potential dynamic newlinepolarization studies were conducted on the the three samples using 3.5% NaCl newlinesolution on natural environmental conditions to increase the corrosion newlineresistance of the base materials. CrN and Cr2N were resistant to corrosion on newlinethe outer surface indicating that dimples, voids and cracks were not formed in newlinethe inner and outer surface layers. newline