Dynamic compressive deformation and failure behavior of Zr-based metallic glass reinforced porous tungsten composite

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 445; pp. 275 - 280
• Main Authors: Xue, Y.F., Cai, H.N., Wang, L., Wang, F.C., Zhang, H.F.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15-02-2007; Elsevier
• Subjects: Applied sciences; Composite; Dynamic compression; Exact sciences and technology; Fracture behavior; Fractures; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metallic glass; Metals. Metallurgy; Split Hopkinson Pressure Bar (SHPB); Dynamic compression; Composite; Fracture behavior; Metallic glass; Split Hopkinson Pressure Bar (SHPB); Work hardening; Rupture; Compression test; Porous material; Composite material; Metallic glasses; Scanning microscope; Hopkinson bar; Tungsten; Shear band; Fractography; Fracture mode; Damaging
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2006.09.025

The dynamic compressive deformation and fracture behavior of the Zr-based metallic glass reinforced porous tungsten composite were investigated at room temperature by means of the Split Hopkinson Pressure Bar (SHPB). Both fracture stress and fracture strain increased significantly compared to the pure metallic glass phase. The deformation behavior of the composite was found to be dominated by the ductile W phase and the 3D net structure of the W phase. It was found that the composite appeared to exhibit some work hardening during the dynamic compressive deformation. The failure mode of the specimen is a mixture of one major shear band and axial splitting, and the shear plane inclined ∼56° with respect to the loading axis. Scanning election microscope (SEM) was used to evaluate damage initiation and propagation. It was found that the increase of fracture stress and fracture strain is due to the interaction between localized shear banding and axial splitting, promoting additional fracture surface area, and large volume fraction of ductile W phase. The dynamic compressive deformation and fracture behavior of the composite are discussed by taking the effect of the complex stress state within the composite into account.