差温异步轧制镁铝复合板界面结合性能的研究

Interface Bonding in Mg/Al Composite Plates Prepared by Differential Temperature Asynchronous Rolling

目的解决镁铝复合板制备过程中工艺复杂、镁铝变形不协调、复合板界面强韧性差等技术瓶颈问题。方法利用ABAQUS软件对差温异步轧制下的镁铝复合板的变形行为进行模拟分析,结合微观表征探讨不同压下率及层厚比对镁铝复合板界面微观结构及性能变化的影响。结果沿厚度方向上,差温异步轧制变形区的温度呈梯度分布,上表面、复合界面和下表面的温度依次递减。随着压下率的增大,界面温度增长幅度也变大,复合效果增强。在压下率为60%时,层厚比为4.5∶1.5的镁铝复合板显示出最优的力学性能。在差温异步轧制下,随着压下率的提高,镁铝复合板在各个层厚比下的抗拉强度以及延伸率均得到提升;压下率越大,板材结合性能越好。结论差温异步轧制工艺通过引入温度梯度及强剪切变形可以细化界面晶粒,增强界面结合性能,可为高质量镁铝复合板的制备及工艺参数优化提供有力的参考依据。

The work aims to solve the technical bottlenecks in the preparation of Mg/Al composite plates such as complex process,incongruous magnesium-aluminum deformation and poor composite plate interface toughness.ABAQUS software was used to simulate and analyze the deformation behavior of magnesium-aluminum composite plates under differential temperature asynchronous rolling.Combined with microcharacterization,the effects of different reduction rates and layer thickness ratios on the changes of the interface microstructure and properties of Mg/Al composite plates were explored.The temperature of the deformation zone of differential asynchronous rolling was distributed in gradient along the thickness direction,and the temperature of the upper surface,composite interface and lower surface decreased successively.With the increase of the reduction rate,the increasing range of interface temperature also increased,and the composite effect was enhanced.At 60%reduction rate,the Mg/Al composite plate with a thickness ratio of 4.5∶1.5 showed the best mechanical properties.Under differential temperature asynchronous rolling,the tensile strength and elongation of Mg/Al composite plate at each thickness ratio were improved with the increase of the reduction rate,and the greater the reduction rate,the better the bonding property of the plate.By introducing temperature gradient and strong shear deformation,the differential temperature asynchronous rolling process can refine the interface grains and enhance the interface bonding properties,which can provide a powerful practical reference for the preparation and process parameter optimization of high quality Mg/Al composite plates.