Co-Cu-Zr-Ti-B合金系におけるアモルファス相の形成

抄録

The microstructure of rapidly solidified ((Cu_0.6Zr_0.3Ti_0.1)_1-xCo_x)₉₈B₂ alloy, which was designed as a combination of Cu-based Cu₆₀Zr₃₀Ti₁₀ alloy with high glass forming ability and Co, was investigated by XRD, DSC and electron microscopy. An amorphous single phase can be obtained in alloys with x = 0, 0.1 and 0.2. Nano-crystalline phase dispersed amorphous phase was formed at the alloy with x = 0.3. Nano-emulsion like structure formation, which is typical solidification structure formed via liquid phase separation, was not detected in Co-Cu-Zr-Ti-B alloys, and this was explained by the negative interaction between Co-Zr, Cu-Zr, Co-Ti and Cu-Ti pairs.