THE EFFECT OF HOT EXTRUSION ON TENSILE PROPERTIES OF Al- 25%Mg2Si COMPOSITE

Current study investigates the effect of hot extrusion on the microstructure and tensile properties of Al-25%Mg2Si composite by using optical microscopy and scanning electron microscopy (SEM). The small ingots were extruded at 520°C at extrusion ratio 6:1 and ram speed of 1mm/s. The microstructural studies of extruded samples by (SEM) revealed that the extrusion process changes the morphology of primary Mg2Si phase from irregular to polygonal or spherical shape. Further results demonstrated that the average size of primary Mg2Si decreases from 200μm to 50 μm after hot extrusion. Also, the ultimate tensile strength (UTS) and elongation values were increased from 108 MPa and 1.8% to 137 MPa and 2.3 %, respectively. Also, hot – extrusion can be due to the fragmentation of Mg2Si phases from continuously structure to dot-like structure, and lead to improvement in tensile properties

کلیدواژه ها:

Al – Mg2Si composite ، Microstructure ، Hot extrusion