大厚比Al/Mg/Al层合板的热轧工艺与性能

Hot-rolling process and properties of large thickness ratio Al/Mg/Al laminates

通过热轧工艺制备初始厚度比(单层镁初始厚度与单层铝初始厚度的比值)为5~40的Al/Mg/Al层合板。采用模拟和实验相结合的方法研究初始厚度比对Al/Mg/Al层合板的应力场、应变场、组织演变和性能的影响。结果表明,随着初始厚度比的增加,层合板的极限抗拉强度和屈服强度增加,界面结合强度和伸长率先增加后降低。当初始厚度比为20时,大厚比Al/Mg/Al层合板具有最佳的综合力学性能,界面结合强度(剥离强度)和伸长率达到最大值,其值分别为12.3 N/mm和23.32%。同时,从模拟和EBSD结果可以看出,当初始厚度比为20时,层合板的变形协调能力最好,铝侧织构转变为剪切织构。当初始厚度比达到40后,层压板的结合性能降低,镁合金的性能占主导地位。

Large thickness ratio Al/Mg/Al laminates with the initial thickness ratio(ITR,the ratio of initial thickness of a single Mg layer to initial thickness of a single Al layer)ranging from 5 to 40 were prepared by hot rolling.The effects of ITR on the stress and strain fields,microstructure evolution and properties of Al/Mg/Al laminates were investigated by means of simulations and experiments.The results show that with increasing ITR,the ultimate tensile strength and yield strength of the laminates increase,while the interfacial bonding strength and elongation increase first and then decrease,and reach their maximum values of 12.3 N/mm(peel strength)and 23.32%,respectively,when the ITR is 20.At this time,the laminates have the best comprehensive mechanical properties,the deformation coordination ability between component metals is the best,and the texture on the Al side changes to shear texture.After the ITR reaches 40,the bonding performance of the laminates decreases,and the performance of the magnesium alloy is dominant.