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利用喷射成形技术制备了Al12Zn2.4Mg1.1Cu高强铝合金,采用扫描电镜分析测试手段,对沉积态、挤压态合金进行了微观组织和拉伸断口分析。结果表明:实验合金沉积坯件组织由均匀细小的等轴晶组织组成,晶粒尺寸为10～20μm;经热挤压后,其组织变得更加致密,晶粒更加细小,尺寸为2～3μm。沉积态合金抗拉强度为358～361 MPa,屈服强度为332～336 MPa,伸长率为6.9%～7.2%;经过挤压后抗拉强度为434～438 MPa,屈服强度为394～397 MPa,伸长率为8.1%～8.7%。沉积态和挤压态合金的断口断裂方式主要为韧性断裂。
The Al12Zn2.4Mg1.1Cu high strength aluminum alloy was prepared by spray forming technique. The microstructure and tensile fracture of the as-deposited and extruded alloy were analyzed by SEM. The results show that the microstructure of the experimental alloy blank is composed of uniform and fine equiaxed grains with a grain size of 10 ~ 20μm. After hot extrusion, the microstructure becomes more dense and the grain size is smaller and the size is 2 ~ 3μm . The tensile strength of the as-deposited alloy is 358-361 MPa, the yield strength is 332- 336 MPa and the elongation is 6.9-7.2%. After extrusion, the tensile strength is 434- 438 MPa and the yield strength is 394-397 MPa , Elongation of 8.1% ~ 8.7%. The fracture fracture modes of the as-deposited and extruded alloys are mainly ductile fracture.