Study On The Interfacial Behavior And Property Of W Fiber Reinforced Zr-Based Amorphous Matrix Composites

Bulk amorphous alloys have excellent mechanical properties compared with traditional crystal alloy materials, such as high yield strength and rigidity at room temperature, roughly a 2% elastic strain limit, very good fracture toughness along with self-sharpening behavior when strike at metal. Therefore, bulk amorphous alloys are of scientific interest in material science field. But poor plasticity of bulk amorphous alloys limits their practical application as a structural material. In order to adjust and improve bulk amorphous alloys integrative properties, control the formation and promulgation of shear band by adding W fiber into Zr-based amorphous alloy to improve plasticity and strength, and the preparation technical parameter influence about the interface of W fiber reinforced Zr-based amorphous matrix composites were studied in the paper. At the same time, the influence of Nb content on the interface reaction was also investigated, and the relation between interface reaction and interfacial strength with mechanical properties was analyzed. Conclusions were as followed:1. A vacuum melt infiltration casting equipment was designed and made by myself. The system of the equipment mainly includes heating unit, vacuum unit, and control unit, etc. W fiber reinforced Zr-based amorphous matrix composites were fabricated by melt infiltrating casting method, and the size of specimen is (?)6x50mm.2. The influence of infiltration temperature and time on the interface reaction was investigated. The results illustrate that the longer infiltration time and the higher infiltration temperature are, the more serious the interface reaction is.3. The influence of Nb content on the interface reaction was also investigated. The results illustrate that the addition of Nb in the matrix reduces the adsorption of Zr atom in the liquid phase at the surface of the W fiber, and improves the combination state of interface.4. The interfacial shear strength of the composite is investigated by the push-out method. The results indicate that the higher infiltration temperature and the moreserious interface reaction are, the higher the interfacial shear strength is.5. The compressive behavior of W fiber reinforced Zr-based amorphous matrix composites was investigated. The results indicate that the plastic behaviors and strength of amorphous matrix composites were improved obviously, and the plastic strain is up to 30%, the compression strength is 2960MPa. The compressive fracture mode due to the state of interfacial combination, whether the interface reaction is weak or serious, the compressive fracture mode is a single shear band fracture, but when the interface reaction is suitable, the compressive fracture mode change to multiple shear band fracture.