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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。
The fracture mechanism of W fiber / ZrTiCuNiBeNb metallic glass matrix composites was studied. The results show that in the macroscopic view, with the increase of fiber volume fraction in the composite, the compressive fracture mode of the composite changes from “self-sharpening” fracture to “tearing” mode of the matrix; The fracture mode of the composite material is actually only controlled by the reinforcement W fiber. In addition to the applied stress, the W fibers are subject to stress concentration due to torsional bending and plugging of the substrate shear band during compression. The fibers are in a complex and complex stress field. When the interfiber deformation in the fibers is sufficient In this integrated stress field, the fiber is in a stable state, the deformation of the matrix in the composite material cuts through the fiber, and the composite material exhibits self-sharpening characteristics. When the interfiber deformation in the fiber is not enough to resist the comprehensive stress field, The intervening splitting, the composite exhibits the characteristic of tearing along the length of the fiber.