MICROSTRUCTURE AND MECHANICAL PROPERTIES FOR ALUMINUM 2024 CHIPS OF VARIOUS PREHEATING TEMPERATURES AND TIMES MANUFACTURING BY HOT EXTRUSION PROCESS

Abstract

The preheating temperature and time for hot extrusion are determined by various factors, such as the composition of the material being extruded, the desired characteristics of the end product, and the specific parameters of the extrusion process.  Preheating is typically required to enhance the material's pliability and facilitate the extrusion procedure.  The preheating temperature exhibited significant variation, ranging from 400 to 500 degrees and the time ranging from 0.5 to 2.5 hr. in the present study. Three groups were chosen according to variety of preheating temperature and time. As a results, the best temperature was obtained by the specimen B (preheating temperature 450, preheating time 0.5 hr.). the result of density was 2.78 g/Cm³, While the hardness value was 150 Hv, so the ultimate tensile strength was 470 MPa. The process efficiency in current research was 76%, it was concluded by homogeneous and non-homogeneous strain.