累积叠轧纯Mg/ZK60镁合金层状金属复合材料的组织与性能

Microstructure evolution and mechanical properties of Mg/ZK60 laminated composite fabricated by accumulated roll-bonding

  • 摘要: 采用累积叠轧技术在300℃下制备了纯Mg/ZK60 Mg合金多层复合板材。经过初始复合后,Mg层和ZK60层晶粒明显细化,随着循环次数的增加,Mg/ZK60复合板材两组元晶粒细化并不明显。两种组元的层厚随着循环次数的上升而逐渐降低,两次循环后Mg/ZK60复合板材出现波浪状组织。累积叠轧后,Mg/ZK60复合板材中Mg层和ZK60层呈现典型的轧制织构类型,0001基面均向轧制方向发生轻微偏转。Mg/ZK60复合板材的强度及延伸率均介于轧制态的ZK60板与Mg板之间,并随着循环次数的增加逐渐提高。Mg/ZK60复合板材室温阻尼性能和高温阻尼性能均介于纯Mg与ZK60之间,而高温下Mg/ZK60复合板材的高温阻尼则与ZK60板材变化趋势相类似。

     

    Abstract: Mg/ZK60 laminated composites were fabricated by accumulative roll-bonding at 300℃ using the pure Mg and ZK60 alloy. After the bonding rolling process, grains of the Mg layers and ZK60 layers are refined obviously. The grain size decreases slightly and the microstructure becomes more homogeneous with increasing of accumulative roll-bonding cycles. The thicknesses of both Mg layer and ZK60 layer decrease gradually with increasing of the accumulative roll-bonding(ARB) cycles. After two ARB cycles, an obvious wavy structure can be observed in the laminated Mg/ZK60 composite and both the Mg layer and ZK60 layer show typical basal plane texture with the 0001 plane slightly incline to rolling direction. The ultimate tensile strength and yield strength locate between the pure Mg and ZK60 alloy sheets. As similar as the tensile properties, the damping capability of Mg/ZK60 laminated composite is between Mg and ZK60 while the composite having similar damping behavior as that of ZK60 sheet at elevated temperature.

     

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