To overcome the trade-off between the devisable microstructure and the excellent tensile ductility of bulk metallic glass composites (BMGCs), a novel ex-situ and in-situ hybrid strategy is successfully proposed to design a series of the work-hardenable ductile Ti-based multilayered BMGCs (ML-BMGCs). The as-prepared ML-BMGCs, consisting of α-phases, β-phases and amorphous phases, exhibit a controllable multilayered structure of the Ti layers and the amorphous layers with alternative distribution. The size and volume fraction of the crystalline phases are tuned by Nb microalloying. It is found that the ML-BMGCs possess a suitable size and volume fraction of the crystalline phases when Nb microalloying content are 5% (at.) or 8% (at.), and they obtain an optimum combination of the specific strength of 243 MPa g kg^­1 or 216 MPa g kg⁻¹, and tensile plasticity of 4.33%±0.1% or 5.10%±0.1%. The deformation mechanism of the as-prepared ML-BMGCs during tension is also revealed. The ex-situ Ti layers and in-situ dendrites together effectively serve as absorbers to suppress the propagation of shear bands and multiply shear bands. And the deformation of ex-situ α-Ti phases by dislocation slip and the transformation from in-situ metastable β-Ti phase to orthorhombic α"-Ti during tension impart significant work-hardening capability to the ML-BMGCs. The present study provides a guidance of developing novel high-performance BMGCs with a controllable microstructure.

为了克服可取的微观结构与块状金属玻璃复合材料（BMGC）优异的拉伸延展性之间的平衡，采用了一种新颖的非原位和原位方法成功提出了一种混合策略，以设计一系列可加工硬化的韧性钛基多层BMGC（ML-BMGC）。由α相，β相和非晶相组成的已制备的ML-BMGC显示出Ti层和非晶层具有可替代分布的可控多层结构。结晶相的大小和体积分数通过Nb微合金化进行调整。已发现当Nb微合金含量为5％（at。）或8％（at。）时，ML-BMGC具有合适的晶相尺寸和体积分数，它们获得了243的比强度的最佳组合兆帕克千克¹或216兆帕克千克^-1，拉伸塑性为4.33％±0.1％或5.10％±0.1％。还揭示了所制备的ML-BMGC在拉伸过程中的变形机理。所述非原位的Ti层和原位树突一起有效地用作吸收剂以抑制剪切带和乘法剪切带的传播。并且，位错滑移引起的非原位α-Ti相的变形以及拉伸过程中原位亚稳态β-Ti相向正交α-Ti的转变赋予了ML-BMGCs明显的加工硬化能力。指导开发具有可控微观结构的新型高性能BMGC。