W丝增强含Co锆基非晶复合材料的变形行为与力学性能

Deformation Behaviores and Mechanical Properties of Tungsten Fiber Reinforced Zr-Based Bulk Metallic Amorphous Matrix Composite Containing Co

摘要:

采用渗流铸造方法制备了W丝增强Zr-Ti-Cu-Be-Co非晶基复合材料，研究了复合材料的变形方式及力学性能。结果表明：W丝增强复合材料在准静态压缩条件下不仅保持了Zr-Ti-Cu-Be-Co非晶基体高的强度，而且表现出很高的塑性。与纯非晶相比提高了900％。随着W丝体积分数的增加，复合材料的变形方式由剪切滑移转变为W丝的弯曲和劈裂。复合材料的宏观塑性变形量与压缩过程中产生的剪切带数量成正比。W丝对非晶基体单一剪切带滑移的阻碍，促进多重剪切带的产生和扩展是复合材料产生大量塑性变形的微观机理。

Abstract:

Tungsten fiber reinforced Zr-Ti-Cu-Be-Co bulk metallic amorphous matrix composite was fabricated by a pressure infiltrating cast method. The deformation behaviors and mechanical properties were investigated. The results indicated that Tungsten fiber reinforced bulk metallic glass matrix composite not only holds high strength of pure Zr-Ti-Cu-Be-Co bulk metallic glass, but also exhibits the strain of more than 900% higher than those of pure Zr-Ti-Cu-Be-Co bulk metallic glass. The compressive failure mode of the composite shifts from shear to the localized fiber buckling and tilting with the increase of the volume fraction of tungsten fibers. The increase in compressive toughness comes from the fibers restricting shear band propagation, promoting the generation of multiple shear bands.