锆基BMG/Cu层状复合材料制备及其力学性能

Preparation and mechanical properties of Zr-based BMG /Cu composites

利用大块非晶在过冷液相区间具有较好的热塑性成形特点,选择锆基非晶Zr60Cu25Al10Fe5和纯Cu,在Zr基非晶过冷液相区内选择合适温度进行热压获得铜/非晶层状复合材料。通过X射线衍射(XRD)、扫描电镜(SEM)和能谱分析仪对该层状复合材料的界面形貌、成分分布以及非晶层的组织稳定性进行了研究,并对所制备的Zr基非晶/Cu层状复合材料室温压缩性能进行测试。结果表明:在温度为693 K,外载荷为150 MPa下,保温90 min,可以制备出Zr基非晶/Cu层复合材料,该复合材料的非晶层没有发生晶化,界面形成了一层原子扩散层,达到了良好的结合,该层状复合材料的压缩强度为850 MPa,并表现出一定的室温塑性,其室温强度满足复合材料的混合定律。

A Zr-based bulk metallic glass （BMG） / Cu laminar composite was fabricated through hot compression process by taking advantage of the excellent thermoplastic forming characteristics of the BMG in the supercooled liquid region （ SLR）. The Zr-based BMG with the composition of Zr60 Cu25 Al100 F% and pure Cu were selected as components of the composites. Morphology and composition distribution at the interface between Cu and Zr-based BMG were investigated by means of scanning electron microscopy （ SEM ） and energy-dispersive X-ray spectrometer （EDS） analysis and the structure stability of the BMG layer during hot compression process was evaluated by using X-ray diffraction （XRD） analysis. The mechanical properties at room temperature of the laminar composite were measured by compression tests. The results indicate that under the applied stress of 150 MPa at 693 K for 90 rain, the Cu/Zr-based BMG laminar composite can be obtained successfully. The BMG layer maintains the amorphous structure, and an atom diffusion layer forms between Cu and Zr-based BMG, showing a good interface. The laminar composites exhibits the compression strength of 850 MPa and some olasticitv at room temperature. The strenzth of the Cu/Zr-based BMG laminar comnosites follows the mixture rule.