The popular strategy of overcoming the brittle fracture of bulk metallic glasses (BMGs) is to develop BMG composites (BMGCs). Most BMGCs consist of a single crystalline phase and glassy phase, and they display enhanced plasticities. However, these BMGCs usually display a trade-off in strength, ductility and fracture toughness as most engineering structural materials, which severely hampers their industrial application. To obtain a pronounced combination in tensile strength, tensile ductility and fracture toughness, the multiphase reinforced dispersive Ti-based BMG composite was successfully prepared via phase engineering. The as-prepared BMGC consists of β-phase, α-phase and glassy phase. The composite manifested the tensile mechanical properties with the yield strength of ~ 1410 MPa, ultimate tensile strength of ~ 1625 MPa, and tensile ductility of ~ 3.6%, and fracture toughness of ~ 110 MPa∙m^1/2. The outstanding tensile properties are attributed to the double toughening of α-phase and β-phase. The high fracture toughness is ascribed to that the coarser dual crystalline phases lead to the devious crack propagation and crack bridging. Our work highlights a novel route for developing high-performance BMGCs.

克服大块金属玻璃（BMG）脆性断裂的流行策略是开发BMG复合材料（BMGC）。大多数BMGC由单晶相和玻璃相组成，并且具有增强的可塑性。但是，这些BMGC通常会像大多数工程结构材料一样在强度，延展性和断裂韧性之间进行权衡，这严重阻碍了其工业应用。为了在拉伸强度，拉伸延展性和断裂韧性方面获得明显的组合，通过相工程成功地制备了多相增强分散性Ti基BMG复合材料。所制备的BMGC由β相，α相和玻璃相组成。该复合材料表现出拉伸机械性能，屈服强度约为1410 MPa，极限拉伸强度约为1625 MPa，^1/2。优异的拉伸性能归因于α相和β相的双重增韧。高断裂韧性归因于较粗的双晶相导致裂纹扩展和裂纹桥接。我们的工作突出了开发高性能BMGC的新颖途径。