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用OM,SEM,TEM和电子万能试验机对不同方法制备的ZK60镁合金薄带的组织和力学性能进行了研究。常规铸造ZK60镁合金轧制后仍为等轴晶组织,晶粒尺寸明显细化,双辊铸轧ZK60镁合金条带温轧变形后,显微组织由树枝晶转变为纤维状变形组织,且有高密度剪切带产生,温轧过程中没有明显的动态再结晶发生。轧制后两种合金均具有良好的力学性能,轧制态铸轧合金的强度明显高于传统铸造合金,伸长率略低于传统铸造合金。退火热处理后两种合金均发生了再结晶,得到等轴晶组织,且铸轧合金的组织比传统铸造合金的组织更加均匀细小。退火热处理使薄带的强度略有下降,而伸长率大幅度提高,退火后双辊铸轧合金和传统铸造合金的抗拉强度、屈服强度和延伸率分别为:388MPa,301MPa,22.9%和311MPa,219MPa,19.3%。镁合金薄带制备过程的晶粒细化归因于剪切带、位错和挛晶的产生及后续退火过程中再结晶。
The microstructures and mechanical properties of ZK60 magnesium alloy ribbon prepared by different methods were studied by OM, SEM, TEM and electronic universal testing machine. The conventional cast ZK60 magnesium alloy is still equiaxed after rolling, and the grain size is obviously refined. The microstructure changes from dendrite to fibrous deformation after the twin-roll cast ZK60 magnesium alloy strip is rolled and deformed There is a high density shear zone, there is no obvious dynamic recrystallization in warm rolling process. After rolling, the two alloys have good mechanical properties. The strength of the as-cast alloy in rolling state is obviously higher than that of the traditional casting alloy, and the elongation is slightly lower than that of the traditional casting alloy. After annealing, the two alloys recrystallized and the equiaxed grains were obtained. The microstructure of the cast alloy was more uniform and smaller than that of the traditional cast alloy. After annealing, the tensile strength, yield strength and elongation of the twin-roll cast alloy and the conventional cast alloy were respectively 388MPa, 301MPa and 22.9%, and the elongation was significantly increased. 311 MPa, 219 MPa, 19.3%. The grain refinement during the preparation of magnesium alloy ribbons is attributed to the generation of shear bands, dislocations and twins and subsequent recrystallization during annealing.