研究了W纤维/ZrTiCuNiBeNb金属玻璃基复合材料的断裂机制。结果表明：宏观上,随着复合材料中纤维体积分数的增加,复合材料的压缩断裂方式从基体控制的＂自锐性＂断裂向＂增强体撕裂＂方式转变;微观上,复合材料的断裂方式实际上只受到增强体W纤维的控制。在压缩过程中,W纤维除了受到外加应力外,还受到由于扭转弯曲、基体剪切带塞积引起的应力集中等,纤维处于一个复杂的综合应力场,当纤维内部的纤维间介变形足以抵抗这个综合应力场时,纤维处于稳定状态,复合材料中基体的变形切过纤维,复合材料表现出自锐性特征;当纤维内部的纤维间介变形不足以抵抗综合应力场时,纤维失稳,沿间介劈裂,复合材料表现出沿纤维纵向撕裂的特征。
Fracture mechanism of W fiber/ZrTiCuNiBeNb metallic glass composites was studied. The results show that with the W fiber volume fraction increasing, the fracture mode of composite changes from the "self-sharpening" controlled by the glass matrix to the "fiber tearing". Under compression load,the W fibers are subjected to complex stresses including bending stress and stress concentration formed due to pile-up of shear bands in martrix acting on W fibers besides the applied stresses. When the stresses are lower than fracture strength of W fiber, the matrix deformation can cut over the fibers and the composite shows "self-sharpening" characteristic. On the contrary, when stresses are higher than fracture strength of W fiber, fibers are unstable and split along the grain boundaries, the composite shows "fiber tearing" characteristics.
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