Effect of Ram Speed on the Microstructure and Mechanical Properties of C-Channel Profiles Extruded Using AA6063 Aluminium Alloy
Extrusion is one of the common methods used for the production of aluminium alloy components employed in automotive and aerospace sectors. Among various extrusion profiles, c-channels are extensively employed in building and architectural applications. The present study aims to understand the effect of ram speed on the microstructure and mechanical properties of C-channel profiles of AA6063 alloy. The homogenized AA6063 billets (580 °C) was preheated to 460 °C before being fed to extrusion press. The C-channel die, which is designed and fabricated using H13 steel, preheated and soaked at 480 °C. C-channel profiles were extruded at ram speeds of 1, 3 and 5 mm/s. It has been found that the grain size decreased with increase in ram speed. This could be attributed to the decelerated grain growth at faster ram speeds. Correspondingly, the yield and ultimate tensile strengths increased with ram speed.
Keywords - Aluminium alloy, Hot extrusion, Ram speed, C-channel profile, Microstructure, Mechanical properties