冷轧制备AlSn20Cu/钢多层板的微观组织和力学性能

Microstructures and Mechanical Properties of AlSn20Cu/Steel Laminated Metal Composites Fabricated by Cold Roll Bonding

摘要:

通过室温冷轧制备出了1060Al/AlSn20Cu/1060Al/钢多层复合板材，并探索了轧制压下量对复合板微观组织和力学性能的影响。利用扫描电子显微镜和电子背散射衍射（EBSD）对复合板微观组织进行表征，通过拉伸试验测量了复合板力学性能。复合板的初始轧制压下量为17%，最小稳定压下量为40%。结果表明，随着轧制压下量的增加，铝合金层中锡相和钢中组织沿轧制方向被拉长，但是纯铝层呈现出等轴晶。随着轧制压下量的增大，复合板抗拉伸强度和界面结合强度增加，而延伸率下降。AlSn20Cu合金层的断裂主要跟其中的锡相有关。

Abstract:

Laminated metal composites (LMCs) of 1060Al/AlSn20Cu/1060Al/steel were fabricated by cold roll bonding, and the effects of rolling reductions on the microstructure and mechanical properties were characterized. The microstructure was observed by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD), and the mechanical properties were examined by tensile tests. The initial rolling reduction was 17%, and the minimum stable rolling reduction was 40%. Results show that the increase in rolling reduction causes an elongation of the Sn phases in the AlSn20Cu layer and lengthening of grains in the steel layer along the rolling direction, whereas the 1060Al layers shows equiaxed grains. The tensile strength and interfacial bonding strength of the composite sheets increase while the elongation decreases with increasing rolling reduction. The fracture of the AlSn20Cu layer is related to the Sn phase.