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Mg17Al12层。Mg和Mg17Al12之间存在一种确定的晶体学位相关系
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 ultra-fine-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 lam inated 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. Mg17Al12 phase with thickness of 150 nm formed at Mg/Al interface after 3 cycles. There existed a definite orientation relationship between Mg17Al12 and Mg which is
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