Wf／ZrTiCuNiBe非晶合金复合材料的界面特征与性能

Interfacial Characteristics and Mechanical Properties of W Fiber Reinforced ZrTiCuNiBe Amorphous Matrix Composite

摘要:

用渗流铸造水淬法制备了φ6mm×50mm的W纤维增强的Zr4125Ti13．75Cu12.5Ni10Be22.5非晶合金复合材料。采用扫描电镜（SEM）分析了相同渗流时间，不同渗流温度复合材料的界面反应形貌，并采用Push-out法测定了界面剪切强度，讨论了界面特征、界面剪切强度与宏观压缩断裂行为之间的关系。结果表明：渗流铸造法制备的W纤维增强Zr41.25Ti13．75Cu12.5Ni10Be22.5非晶合金复合材料明显提高了非晶合金的塑性和断裂强度。复合材料界面结合包括界面扩散和界面反应两个过程。界面反应程度加剧时界面剪切强度增大，复合材料的破坏方式由纵向劈裂转变为剪切破坏。

Abstract:

The W fiber reinforced Zr41.25Ti13.75Cu12.sNi10Be22.5 amorphous matrix composites with 50 mm in length and 6 mm in diameter have been produced by the melt infiltration casting method. The interface reaction appearance of the composite was analyzed by scanning electron microscopy at the same infiltration time and different infiltration temperatures. The interfacial shear strength of composite is determined by the push-out method. The relations between the macroscopically compressive fracture behaviors with the interracial characteristics and shear strength are discussed in the end. The results indicate that the plastic behaviors and fracture toughness of amorphous alloy were improved obviously, the interracial combination of composites included the two processes of interface diffusion and interface reaction, and the interracial shear strength increased when the interface reaction was pricked up. At the same time, the compressive failure mode of composite changed from the longitudinal split to the single shear failure.