利用OM, SEM, TEM, 数字显微硬度计和电子万能试验机, 对常规轧制与铸轧法制备的AZ451镁合金薄带的显微组织和力学性能进行了分析. 常规铸锭轧制后仍为等轴晶组织,晶粒尺寸明显细化. 铸轧条带在350℃多道次轧制后显微组织由树枝晶转变为纤维状变形组织, 350 ℃/10 min热处理后合金发生再结晶, 得到等轴晶组织. 轧制后两种合金均具有良好的力学性能, 双辊铸轧合金的强度和延伸率均明显高于传统铸造合金的强度和延伸率, 两种合金1 mm厚薄带经350℃/10 min均匀化退火后的抗拉强度、屈服强度和延伸率分别为334.4 MPa, 229.3 MPa, 23.8%和270.8 MPa, 174.4 MPa, 10.8%. 两种合金的断口形貌均呈现河流花样, 撕裂棱和韧窝共存, 是明显的韧性断裂, 铸轧合金的韧窝更明显, 尺寸更小一些, 这与铸轧合金的组织更细小有关.
Magnesium sheets produced by different process were studied in this paper. The microstructure and mechanical properties of the alloys were analyzed by optical microscope (OM)、scanning electron microscope (SEM)、transmission electron microscope (TEM) 、digital microhardness tester and electron test equipment. The conventional casting ingot and twin rolling casting strip were all can be hot rolled at certain temperature and get magnesium sheets with 1mm thickness had refined and uniform deformation microstructure, the alloys were recrystallized after heat treatment and got equiaxed structure. The alloys had good mechanical properties after hot rolling, the strength and the elongation of twin roll casting alloy were evident higher than those of the conventional casting alloy. The tensile strength, yield strength and elongation of twin roll casting alloy and conventional casting alloy after hot rolling and 350℃×10min annealing were 334.4MPa, 229.3MPa, 23.8%, and 270.8MPa, 174.4MPa, 10.8%, respectively. The fracture surface of the alloys all took on ductile fracture contains lacerated ridge and ductile sockets, but the twin roll casting alloy had more evidence and smaller ductile sockets, this because the grain size of twin roll casting alloy was finer than that of conventioanal casting alloy.
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