The multiphase Ti-based bulk metallic glass composites (BMGCs) consisting of β-Ti dendrites, island-like Ti₂Cu intermetallic phases and glassy matrix were designed, and their mechanical properties were investigated by room temperature compression tests. The effect of brittle intermetallic Ti₂Cu phase on the mechanical properties and fracture mechanism of multiphase BMGCs was also discussed. Microstructure was adjusted by minor Sn addition and the characteristic sizes of the β-Ti dendrites and glassy matrix decreased with the increase of Sn content. Under compressive loading, the yield strength increased from approximately 1056 MPa to 1429 MPa. The increased yield strength was ascribed to the size effect of the glassy matrix, solid solution strengthening of the β-Ti dendrites and precipitation of the Ti₂Cu intermetallic phase. The fracture behaviour was related to the slip bands generating within the dendritic arms and the micro-cavities originating from the interface between the Ti₂Cu intermetallic phase and glassy matrix. The existence of the brittle intermetallic phase will not deteriorate the mechanical properties of Ti-based BMGCs. The results may provide an insight into tuning microstructure of the multiphase Ti-based BMGCs to achieve excellent mechanical properties.

设计了由β-Ti枝晶、岛状Ti ₂ Cu金属间相和玻璃状基体组成的多相Ti基块状金属玻璃复合材料（BMGCs），并通过室温压缩试验研究了它们的力学性能。脆性金属间化合物Ti _2的影响还讨论了Cu相对多相BMGCs的力学性能和断裂机理的影响。微量Sn的添加调整了显微组织，随着Sn含量的增加，β-Ti枝晶和玻璃状基体的特征尺寸减小。在压缩载荷下，屈服强度从大约 1056 MPa 增加到 1429 MPa。屈服强度的提高归因于玻璃基体的尺寸效应、β-Ti枝晶的固溶强化和Ti ₂ Cu金属间相的析出。断裂行为与树枝状臂内产生的滑移带和源自Ti _{2界面的微腔有关。}铜金属间相和玻璃状基质。脆性金属间化合物的存在不会降低钛基BMGCs的力学性能。该结果可以深入了解多相 Ti 基 BMGC 的微观结构，以实现优异的机械性能。