Achieving work hardening in metallic glass matrix composites (MGMCs) is the key to the extensive use of these attractive materials in structural and functional applications. In this study, we investigated the formation of nanoscale boundaries resulted from the interaction between matrix and dendrites, which favors the work-hardening deformation in an in-situ Ti₄₁Zr₃₂Ni₆Ta₇Be₁₄ MGMC with β-Ti dendrites in a glassy matrix at room temperature. The microstructures of samples after tension were observed by high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD). The work-hardening mechanism of the present composites involves: (1) appearance of dense dislocation walls (DDWs), (2) proliferation of shear bands, (3) formation of boundaries on the nanoscale, and (4) interactions between hard and soft phases. A theoretical model combined with experimental data reveals the deformation mechanisms in the present work, proving that the in-situ dendrites with outstanding hardening ability in the glass matrix can provide the homogeneous deformation under tensile loading at room temperature.

在金属玻璃基复合材料（MGMC）中实现加工硬化是在结构和功能应用中广泛使用这些有吸引力的材料的关键。在这项研究中，我们研究了基体和枝晶之间相互作用导致的纳米级边界的形成，这有利于原位Ti ₄₁ Zr ₃₂ Ni ₆ Ta ₇ Be ₁₄的加工硬化变形。室温下，具有β-Ti的MGMC会在玻璃状基质中树枝状生长。通过高分辨率透射电子显微镜（HRTEM）和X射线衍射（XRD）观察了拉伸后样品的微观结构。本发明复合材料的工作硬化机理包括：（1）致密位错壁（DDWs）的出现；（2）剪切带的扩散；（3）在纳米尺度上形成边界；以及（4）硬与软之间的相互作用阶段。理论模型与实验数据相结合揭示了本文的变形机理，证明了在玻璃基体中具有出色硬化能力的原位枝晶在室温拉伸载荷下可以提供均匀的变形。