Preparation And Mechanical Properties Of Zr-based Bulk Metallic Glasses Composites

Increasing attention is paid to the fabrication, glass-forming ability, thermal stability and mechanical properties of bulk metallic glasses, more importantly, to what is the key of controlling those properties. These investigations are important theoretically in science and practically in application. Furthermore, the study on the bulk amorphous matrix composites will offer a desirable material to some areas in the world. This paper was focused on fabrication, glass-forming ability and mechanical properties of bulk metallic glass and amorphous matrix composites, it includes:1. Bulk metallic glass (Zr_0.60Ni_0.22Al_0.18)₉₄Ti6 and (Zr_0.60Ni_0.22Al_0.18)₉₆Fe₄ with 3 mm diameter were prepared by copper mold suction casting method, and then semi-solid alloy samples were handled.2. X-ray diffraction analysis of the semi-solid processing effects on glass forming ability, through SEM, EDX and other research on semi-solid microstructure of alloys. DSC analysis the thermal stability of amorphous materials of using semi-solid processed. Amorphous alloy semi-solid processing makes crystal phase precipitation to improve the critical cooling rate, while the amorphous alloys by reducing the size of the supercooled liquid, reducing the thermal stability of amorphous alloys.3. Compressive mechanical properties and fracture morphology analysis showed that the semi-solid treatment on the mechanical properties of amorphous alloys plays a crucial role. Relative to the fully amorphous alloy, the bulk metallic glass matrix composite (Zr_0.60Ni_0.22Al_0.18)₉₄Ti6 and (Zr_0.60Ni_0.22Al_0.18)₉₆Fe₄ in the presence of crystalline phase to stop the expansion of a single shear band, induced the formation of more shear zone, which makes plastic deformation capacity has been greatly improved. The higher volume fraction and larger grain size of the composite material (Zr_0.60Ni_0.22Al_0.18)₉₆Fe₄ dendrite phase which leads to brittle fracture. Bulk amorphous alloy matrix composite mechanical properties change with the unique structure.4. Bulk amorphous alloys and its composites (Zr_0.71Fe_0.15Cu_0.14)_100-x (Si)_x and (Zr(0.71)Fe_0.15Cu_0.14)_100-x (AlNi)_x were prepared by Cu copper mold suction casting method. Using X-ray diffraction (XRD), scanning electron microscopy (SEM) and other means to study the effect of NiAl and Si on microstructure, compressive mechanical behavior and fracture feature of the alloys. Furthermore it is necessary to further develop optimizing phase formation and the microstructure by controlling the composition and processing conditions of alloys.