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采用铸坯挤压制备具有最终试样二维几何特征的AZ61镁合金预成形坯材,经过一次纵向模压制备了近终成形的拉伸试样,对试样进行了组织和拉伸性能检测。实验结果表明:在挤锻复合成形工艺过程中,材料组织经过变形与再结晶,晶粒尺寸从铸态的121μm细化为挤压态的8~15μm,锻压后进一步细化到2~5μm。经历了挤锻复合成形后,材料的室温抗拉强度、屈服强度、伸长率和硬度分别达到315.2MPa2、27.4MPa和20.5%,比铸态分别提高了42.4%、76%和71%;拉伸失效断口也从铸态的准解理断裂过渡为模压后以韧性断裂为主的特征。
The AZ61 magnesium alloy preform with the final two-dimensional geometric features of the final sample was prepared by the slab extrusion. After one longitudinal compression test, the tensile specimens were prepared and the microstructure and tensile properties of the specimens were measured . The experimental results show that during the process of extrusion-forging, the microstructure of the material is transformed and recrystallized. The grain size is refined from as-cast 121μm to 8-15μm in the as-extruded state and further refined to 2-5μm after forging. After extrusions and forming, the room temperature tensile strength, yield strength, elongation and hardness of the materials reached 315.2MPa2, 27.4MPa and 20.5% respectively, increased by 42.4%, 76% and 71% Elongation fracture also transition from as-cast quasi-cleavage fracture toughness fracture-based features.