fabricated a series of dendrites reinforced Zr-based BMG composites that exhibit a pronounced tensile ductility >10% and a fracture toughness as high as 170 MPa m 1/2. By controlling the dendrite size and inter-dendrite spacings, Hofmann et al. for the first time prepared an in-situ Zr-based BMG composite consisting of ductile β-(Ti–Zr–Nb) phase dendrites, which exhibited an extended plasticity ∼7%. (i) ‘In situ' precipitation of crystalline phases. In general, there are two pathways to synthesize BMG composites. To impede the catastrophic failure, ductile phases were generally introduced into BMGs to form BMG matrix composites, hindering the extension while encouraging the proliferation of shear bands. However, the plastic deformation of BMG always localizes in very narrow shear bands of ∼10 nm in thickness, which tends to evolve into open cracks and catastrophic broken at ambient temperature, severely hampering their industrial applications. Metallurgical bonding was achieved at the interface between BMG matrix and the Ti6Al4V frame.īy tuning the geometry of Ti6Al4V frame, the BMG composites exhibited high fracture toughness of about 213 MPa m 1/2 and a bending strength of about 1 GPa.īulk metallic glasses (BMGs) display a plethora of desirable mechanical, chemical and physical properties. Our findings providing a promising route for the fabrication of strong-and-tough BMG composites. Our findings provide a promising route for the development of metallic composites. By tuning the geometry of Ti6Al4V frame, the composites manifest an enhanced fracture toughness of 213 MPa m 1/2, 2.3 times higher than that of the monolithic bulk metallic glass. The interface characterization between matrix and frame reveals a typical metallurgical bonding. Inspired by the aseismic structure of skyscrapers, Ti6Al4V frames with tubular structure were designed, 3D printed and thermoplastic formed with Zr 35Ti 30Be 26.75Cu 8.25 bulk metallic glass matrix under ultrasonic vibration, forming sandwich-structured bulk metallic glass composites.
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