中文摘要：

通过室温累积叠轧技术制备了Mg/Al多层复合板材,借助SEM、EDS、TEM和同步辐射CT形貌观察等先进表征手段对累积叠轧Mg/Al金属复合板材界面结合进行表征,揭示累积叠轧Mg/Al金属复合板材界面宏观结合状态以及微观界面结构。结果表明,Mg/Al复合板材界面总体上结合良好,没有明显孔洞和开裂,但板材内部仍然存在一些孔洞和局部微小裂纹。3次循环后Mg/Al界面处形成了厚度为150 nm的Mg（17）Al（12）层。Mg和Mg（17）Al（12）之间存在一种确定的晶体学位相关系[111]Mg（17）Al（12）//[1210]Mg、（110）Mg（17）Al（12）//（1011）Mg,而Mg（17）Al（12）和Al之间是否有位相关系并不明显。

英文摘要：

Mg and its alloy have large potential in weight reduction usages because of their low density. However, the relatively low strength and modulus hinder their widely applications. Accumulative roll bonding（ARB） is one kind of severe plastic deformation（SPD） process which can produce bulk ultrafine-grained（UFG） metallic materials. In order to improve the strength, elastic modulus and corrosion resistance of Mg sheet, accumulative roll bonding was utilized to fabricate UFG Mg/Al laminated composites at ambient temperature in this work. Synchrotron radiation-based computer tomography, SEM and TEM were employed to characterize the global bonding condition and the interface structure of Mg/Al laminated sheet ARBed after 3 cycles. No obvious cracks could be observed along the bonding interfaces during ARB, although small amount of tiny pores existed in some area. Mg（17）Al（12） phase with thickness of 150 nm formed at Mg/Al interface after 3 cycles. There existed a definite orientation relationship between Mg（17）Al（12） and Mg which is [111]Mg（17）Al（12）// [1210]Mg,（110）Mg（17）Al（12）//（1011）Mg. Nevertheless, the orientation relationship between Mg（17）Al（12） and Al is not very obvious.