EFFECT OF EXTRUSION RATIO OF RECYCLING ALUMINIUM AA6061 CHIPS BY THE HOT EXTRUSION PROCESS
Abstract
This research investigated the effects of hot extrusion parameters in direct recycling aluminium alloy chips (AA6061) focusing on automotive and light tools application. The experiments have been carried out using 250T hot extrusion machine. Due to the substantially increased demands of aluminium, it is required for improvement of its mechanical properties by using a suitable approach combination of recycling aluminium chips. The extrusion process was also affected by the strength of the material, which is a combination of optimum extrusion ratio, preheat temperature and preheat time. The most principle parameter of processing wrought alloys is temperature and extrusion ratio. Tensile test results showed that, material extruded at 550°C exhibited higher mechanical properties, compared to that extruded at 450°C at ER 12 and ER 6. The result shown for UTS as-received is 328 MPa, ASM Theory AA6061-T4 is 240 MPa and best recycling chips providing UTS is 189 MPa (before the heat treatment process). The tensile of the chip will increase to tensile as-received after the heat treatment process. Hot extrusion parameter showed that temperature gave more significant effect in responses rather than preheating time hence the higher Extrusion Ratio (ER) give a better results on Ultimate Tensile Strenght .
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