Description
Summary:Over the past two decades of advanced materials and in particular, nanoparticles alloy have gained tremendous attention in science and technology. Nickel-aluminium intermetallic alloy exhibit considerable potential for near-term application in various branches of modern industry due to lots of advantages, such as low density, high melting temperature, high thermal conductivity and high specific modulus. In this research, the material was prepared by using grinding technique and undergo heat treatment consisting of three basic steps that are mechanical milling of nickel and aluminium powder at different composition, compaction of powder by using uniaxial hydraulic pressing and sintering of powder pellet at their specific temperature. Microstructural evolution and the relationship between microstructure and mechanical properties of different composition Ni-Al intermetallic alloy were investigated by using X-ray diffraction, scanning electron microscopy, Vickers hardness and direct measurement of density. From the result of XRD, lattice parameter and crystallite size of each Ni-Al intermetallic alloy can be calculated. It shows that Ni-Al intermetallic alloy produced by increasing nickel composition will give increment in crystallite size which are 0.38nm, 0.35nm, 0.34nm are. 0.33nm, 0.29 nm. The image of SEM shows formation of different shape and phase of structure where different sintering temperatures gave impact on the morphology. Density after sintering process show higher value compared to density before the sintering process. This is due to properties manipulation of heat treatment where refinement of the grain structures and decrement of pores occurs. The hardness testing is by using Vickers hardness testing with 0.5kgf of load shows that Ni-Al intermetallic alloy with highest nickel and highest aluminium composition provide high hardness result and the hardness value also increase up after receiving heat treatment.