The Effect Of Heat Treatment Schedule On Mechanical Properties Of Different Carbon Nanotubes Contents In Aluminium Alloy Composites

Lau, Carolyn Yee Jie (2019) The Effect Of Heat Treatment Schedule On Mechanical Properties Of Different Carbon Nanotubes Contents In Aluminium Alloy Composites. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The present research deals with the study of A356 aluminium alloy reinforced with Multi-Walled Carbon Nanotubes (MWCNTs) prepared by permanent mould casting for feedstock preparation and thixoforming process in a hydraulic cylinder press to form Metal Matrix Composites (MMC). The effect of T5 and T6 heat treatment schedule on thixoformed MWCNTs/A356 are investigated. The contents of MWCNTs are 0.5wt. % and 0.75wt. % respectively, which will be wrapped with 0.5wt. % of Magnesium (Mg) flasks as a wetting agent. The mixture of A356 and MWCNTs is stirred in 10 and 15 min by using a turbine type mechanical stirrer. After thixoforming process, T6 heat treatment is performed to thixoformed MWCNTs/A356 composites with solution heat treatment at 540 ºC for 8 hours, quenching process at 24 ℃ and continued by artificial ageing at 150 ℃ for 4 hours, while T5 heat treatment also will be aged at 150 ℃ for 4 hours but without solution heat treatment. The microstructure of each specimens are characterised with Optical Microscopy (OM), Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). Universal Testing Machine (UTM) and Vickers Hardness Tester are the equipment that used to conduct the hardness test and tensile test according to ASTM: E8M standard. Optimization of the MWCNT-A356 alloy composites feedstock fabrication process parameters using DOE of Taguchi Method. The results showed the formation of non-dendritic microstructure and achieved a homogeneous distribution phase for the heat-treated thixoformed MWCNTs/A356 composites. T6 heat-treated specimens revealed higher hardness and tensile strength compared to the T5 heat-treated specimens.

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