采用累积叠轧焊(ARB)工艺制备超细晶组织AZ31镁合金薄板。实验结果表明,进行 3道次ARB变形后,AZ31板材晶粒显著细化,平均晶粒尺寸约1.3μm,呈等轴状,材料组织均匀,没有发现孪晶。采用EBSD技术观察组织演变和晶粒的取向差。ARB变形过程中的晶粒细化可归因于累积应变诱导的晶粒细化、累积应变强化回复和再结晶以及ARB变形过程中复杂的界面和剪切应变分布。 The ultrafine grain structure AZ31 magnesium alloy sheet was prepared by accumulative roll bonding (ARB) process. The experimental results show that after three times of ARB deformation, the grain size of AZ31 plate is obviously refined with an average grain size of about 1.3 μm, equiaxed, uniform in texture and no twins are found. EBSD techniques were used to observe tissue evolution and grain orientation differences. Grain refinement during ARB deformation can be attributed to cumulative strain-induced grain refinement, cumulative strain recovery and recrystallization, and complex interfacial and shear strain distributions during ARB deformation.