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采用金相显微镜和扫描电境观察了LZ91镁锂合金在累积叠轧焊(ARB)过程中的界面焊合现象。结果表明:道次压下量为50%的ARB工艺可以使LZ91板材获得良好的界面焊合,板材的抗拉强度和维氏硬度得到明显的改善。后续的ARB变形可以有效改善界面焊合质量,ARB轧制后退火可以使板材界面焊合强度增加。LZ91合金累积叠轧焊变形中的界面焊合机制是:合金表面硬化层先发生破裂,新鲜金属暴露,然后在轧制压力的作用下一起流动、相互接触,最终形成冶金结合。
The interface welding phenomenon of LZ91 magnesium lithium alloy during cumulative roll-bonding (ARB) was observed by optical microscope and scanning electron microscope. The results show that the ARB process with 50% pass reduction can obtain good interface welding of LZ91 sheet, and the tensile strength and Vickers hardness of the sheet are obviously improved. Subsequent ARB deformation can effectively improve the quality of the interface welding, annealing after ARB rolling plate interface can increase the welding strength. LZ91 alloy cumulative stack welding deformation welding interface welding mechanism is: the alloy surface hardening layer rupture first, fresh metal exposure, and then under the action of rolling pressure flow together, contact with each other, the final formation of metallurgical bonding.