Study on microstructure and mechanical properties of quenching AZ31B in nano-fluid

Tee, Kuo Chun (2023) Study on microstructure and mechanical properties of quenching AZ31B in nano-fluid. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

AZ31B Magnesium Alloy was widely employed in a variety of applications, including automotive, contemporary aircraft fuselages, mobile phone, and laptop casings. This is due to its high strength and flexibility at room temperature, as well as its corrosion resistance and weldability. However, studies indicate that the composition of AZ31B is insufficient to sustain energy absorption, leading this material to fracture. This is owing to the Hexagonal Close-Packed (HCP) structure's low mechanical strength and ductility. Thus, this investigation will explore the impact of Graphene Oxide (GO) as nano fluid quenching medium on the mechanical properties of AZ31B. The AZ31B undergo a 3-hour heat treatment process at the specified temperatures of 250 °C and 350 °C, then immersed for 30 minutes in five different fluid media: air, distilled water, distilled water mixed with 0.1 wt %, 0.3 wt %, and 0.5 wt % of Graphene Oxide to examine the effect of nano fluid media on AZ31B strength. The microstructure analysis was conducted using the Scanning Electron Microscope (SEM) and Energy Dispersive X-Ray Spectroscopy (EDX) to observe the surface properties of Magnesium Alloy AZ31B and the presence of GO in varying amounts in the quenching medium.The surface roughness analysis was also carried out to determine the roughness,(Ra)value of AZ31B Magnesium Alloy's after the heat treatment and quenching process done. Besides, the tensile test utilising dog-bone shaped sample was performed to estimate the ultimate tensile strength (UTS), yield strength, and young modulus of AZ31B following the heat treatment and quenching method for mechanical characteristics analysis. From the analysis, result showed that specimen with temperature treatment of 350 ℃ has a smooth surface and low (Ra) value in between 1.869 till 1.964 µm. Besides, the specimen also showed high (UTS),Yield Strength and Young Modulus value in compared to the control sample and specimens that undergo 250℃ as heat treatment temperature. Furthermore, result from the analysis also proved that specimen with various wt % of GO in quenching media affect the microstructure and mechanical properties of AZ31B Magnesium alloy to have a smooth surface and high mechanical properties such as UTS of (250.305 MPa), Yield Strength value of (130.086 MPa) and Young Modulus of (5608.85 MPa) due to the presence of high concentration element Carbon (C) and Oxygen (O).Therefore, this study concluded that specimen with temperature of heat treatment of 350 ℃ followed by sink in Distilled Water + 0.3 wt % GO medium showed is the best parameter to achieve smooth surface and good mechanical properties for AZ31B alloy.

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