Microstructural characterization of the emulsified Cu₄₇Ti₃₃Zr₁₁Ni₆Sn₂Si₁ alloy powder

Phase selection and microstructural morphology change of the Cu₄₇Ti₃₃Zr₁₁Ni₆Sn₂Si₁ alloy were investigated through the droplet emulsion technique(DET). The emulsified Cu₄₇Ti₃₃Zr₁₁Ni₆Sn₂Si₁ alloy powders showed several different microstructures depending on the amount of undercooling. The amount of undercooling of the powders was monitored by differential thermal analysis and was matched with the microstructures. The phase transition of Cu₄₇Ti₃₃Zr₁₁Ni₆Sn₂Si₁ alloy powders according to the increase of undercooling proceeds by the process Cu₄Ti₃ +CuTi +Cu₂Ti +Cu₅₁Zr₁₄ → Cu₄Ti₃ + CuTi + Cu₂Ti + Cu₅₁Zr₁₄ + CuTi₂ → Cu₂Ti + Cu₅₁Zr₁₄ + CuTi₂ → Cu₅₁Zr₁₄ +CuTi₂. Specifically, the morphology and scale of the CuTi2 phase were examined by SEM observation, and area fraction measurement using an image analyzer, transmission electron microscopy studies, and microhardness tests showed that the amorphous phase could be synthesized by DET. A microstructure selection map of Cu₄₇Ti₃₃Zr₁₁Ni₆Sn₂Si₁ alloy powders for tailored solidification was also suggested.