student profile: Mr Naveed Aziz Khan


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Thesis work

Thesis title: Fabrication and Characterization of AlCoCrCuFeNi High Entropy Alloy (HEA) Thin Films Grown by RF Magnetron Sputtering

Supervisors: Jun HUANG , Zongwen LIU

Thesis abstract:

The high entropy alloys (HEAs) also known as the multi-principal element alloys (MPEAs) was first reported in the year 2004 which consist of at least five principal elements in equimolar or near equimolar ratios and the concentration of each principal elements can vary in between 35 and 5 at. %. The bulk HEAs are widely studied for their exceptional properties such as high corrosion resistance, good mechanical properties, and thermal stability. However, HEA thin films are also becoming popular and they also exhibit many potential properties and can be used as heat or wear resistant coatings, diffusion barriers, soft magnetic films, and coating materials for high temperature applications. Hence, an effort is being made in this work to understand the microstructural properties of HEA thin films which are essential for micro and nanoscale applications.
In this work, microscopic characterization will be performed on the HEA thin films of AlCoCrCu0.5FeNi which are deposited by RF magnetron sputtering under pure argon and various oxygen partial pressures and some of them are subsequently annealed at high temperature under vacuum. The thin films are deposited on silicon and glass substrates and their fundamental growth mechanism will be extensively studied by sophisticated characterization methods like XRD, XPS, AFM, Nanoindententation, SEM, EDX, PPMS, UV-Vis and TEM. The data obtained can provide information about the growth mechanism, defect levels, and identify the structural phases. SEM integrated with EDX and TKD system can provide the crucial information regarding the surface morphology, chemical composition, phase orientation, grain boundary and mapping information.Therefore, the outcome of this research is anticipated to reveal many fundamental properties of AlCoCrCu0.5FeNi HEA thin films exhibiting exotic material properties which could have the potential to be a promising coating material with superior hardness, anti corrosion properties and high temperature stability.

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