Abrasive Wear Resistance Of (Cu, Ti) Based Metallic Glass

Bulk metallic glass became a good application opportunities engineering materials, because of high strength and high hardness and superior toughness, so the studying of its mechanical behavior is one of important base for engineering application. According to crystalline metallic alloys, high hardness and toughness expected superior wear properties, so it is necessary to study wear resistance of metallic glass. In this paper, the crystallization kinetics of the Ti_41.5Zr)(2.5)Hf₅Cu_42.5Ni_7.5Si₁ metallic glass was investigated by differential scanning calorimetry (DSC), the crystallization process of Ti_41.5Zr_2.5Hf₅Cu_42.5Ni_7.5Si₁ metallic glass was investigated by X-ray diffractometry, effects of annealing on the mechanical properties of Ti_41.5Zr)(2.5)Hf₅Cu_42.5Ni_7.5Si₁ metallic glass was measured by Microhardness Tester and mechanical test machine, and the abrasive wear properties of Ti_41.5Zr)(2.5)Hf₅Cu_42.5Ni_7.5Si₁ metallic glass and annealed isothermally at 700K and 773K for 15 minutes respectively were investigated by pin-on-disc measurement and scanning electron microscope(SEM) and atom force microscope(AFM).According to the DSC curves at different heating rates and the modifiedKissinger law, the apparent activation energy of Tg and Tx were 718.6 kJ · mol^-1 and274.5 kJ·mol^-1 respectively. The crystallization form of Ti_41.5Zr)(2.5)Hf₅Cu_42.5Ni_7.5Si₁ metallic glass occurred through four stages as follows: Am(Amorphous)→ Am' + Cu₄Ti₃ →Am" + Cu₄Ti₃ + Cu_0.1Si_1.9Ti →Am''' + Cu₄Ti₃ + Cw_0.1Si_1.9Ti + CuTi →Am + CuTi + Cu_0.1Si_1.9TiThe micro hardness of Ti_41.5Zr)(2.5)Hf₅Cu_42.5Ni_7.5Si₁ metallic glass were increased because of the increased of annealed temperature, and the character of compress failure translated from elasticity—plasticity to elasticity deformation—without plasticity, and the characters of fracture translated from elasticity to cleavage and brittle that were determined by amorphous and crystalline phase respectively.Abrasive wear of Ti_41.5Zr)(2.5)Hf₅Cu_42.5Ni_7.5Si₁ metallic glass and the annealed...