A6063 合金の再結晶集合組織に及ぼす押出条件の影響

The effect of extrusion conditions on recrystallization texture and preferential orientation formation of A6063 aluminum alloy extruded material was evaluated by electron back scattered diffraction (EBSD) technique and the extrusion simulation. Samples were prepared by different extrusion conditions as follows; extrusion temperature at 773 and at 813 K, the extrusion ram speed to 3 and 10 mm/s, and the extrusion ratio for 28.9, 34.7 and 66.6. The recrystallized texture of the extruded material was mainly composed of Cube orientation and Goss orientation in which〈100〉was oriented parallel to the extrusion direction. The Brass, S, {112}〈110〉orientation in which the 〈111〉orientation was oriented in the extrusion transverse line direction was the preferential orientation on the surface. The distribution of texture corresponded to the distribution state of extrusion shear stress found by simulation. The magnitude of the shear stress also changed by changing the extrusion conditions, and the presence ratio of the Brass, S, {112}〈110〉orientation of the surface was changed, but the major orientation did not change.