Effect of silicon carbide (SiC) on mechanical and physical properties of solid state recycled aluminium aa6061 by using hot extrusion method

In solid state recycling processes, there are two methods in recycling aluminium which are conventional and direct conversion methods. Direct conversion method is a current approach that excludes the metal chips re-melting process compared to the conventional recycling method. Direct conversion in a hot extrusion process that contributes to the green technology production in reducing energy consumption, operating costs and parts. This research aims to investigate the effect of silicon carbide (SiC) on mechanical and properties of recycled aluminium AA6061 produced by hot extrusion method. This study employed full factorial 23 design experiments that should satisfy the two operating temperature (T) of 450°C and 550°C, with two preheating time (t) of 1 hour and 3 hour reinforced with two volume fraction of silicon carbide (SiC) of 5 wt.% and 15 wt.%. Response Surface Methodology (RSM) utilized the factor towards the response which is Ultimate Tensile Strength (UTS), Elongation to Failure (ETF) and Microhardness (MH). The best parameter setting for the extrusion was found to be at T=550°C, t=1 hour and SiC=5 wt.%. This parameter resulted in UTS=18022 MPa, ETF=18.07%, MH=71.52Hv, and Density=2.73 g/cm3. Based on RSM, with desirability of 87.67%, the optimum parameter T=550°C, t=2 hour and SiC=5 wt.% were suggested an optimized composite performance. The mechanical properties were analyzed by tensile and microhardness testing. While that, the physical property analysis was focusing on density and microstructure analysis. In conclusion, hot extrusion process was proven as an alternative method in direct recycling of aluminium chips.

Name dc:type.qualificationname

mphil

Level dc:type.qualificationlevel

masters

Grantor dc:publisher.institution

Universiti Tun Hussein Onn Malaysia

Year dc:date.issued

2020

Author dc:creator

• Kuddus, Suriyanti

• QC501-766 Electricity and magnetism

Language dc:language

en