A newly spiral channel mechanism to produce non-dendritic grains microstructure of aluminium alloy for semi-solid processing

Abd Rahim, Muhammad Hafiz (2021) A newly spiral channel mechanism to produce non-dendritic grains microstructure of aluminium alloy for semi-solid processing. Project Report. Melaka, Malaysia, Universiti Teknikal Malaysia Melaka. (Submitted)

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Abstract

The purpose of this thesis presents grain dendritic microstructure form change into non-dendritic microstructure form in the aluminium alloy (A356) for semi-solid metal processing. In this situation, one of the ways employed to generate a nearly spherical shape is the cooling slope. The explanation for this operation is the challenge of managing the process and air entrapment, the cost, the water cooler's need maintenance, and parameters that directly impact the microstructure. The aim of this study, to fabricate a new design spiral channel. Next, to compare the spherical factor between spiral channel casting and direct casting, and to analyze microstructure using the T-test method. Initially, create two spiral channel design concepts using Catia V5 software and Solidworks software. Analyze and choose the best drawing design to fabricate the spiral channel. The A356 is heated by using a furnace until it reached a temperature of 700˚C. Pouring melted alloy into mold with spiral channel and direct casting. After that, the product needs to do a metallographic procedure. All specimens should be measured using optical microscopy (OM) with iSolution DT software. Analyzed the data to do a T-test analysis. Comparison roundness of grain size between the spiral channel and direct casting. T-test analysis generates by Minitab software show the graph and calculates the p-value. Besides, the effect is non-dendritic for semi-solid metal processing. To achieve the success of the project, the spiral channel can be successfully produced according to the detailed drawing that has been created. In comparison to direct casting, the spiral channel approach produces better globular quality, according to OM observations. Using the Minitab software, the roundness calculations for spiral channel and direct casting were revealed by t-test analysis.

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