Preparation and crystallization behavior of Cu-Zr-Ti amorphous composite powders

Three Cu-Zr-Ti plate-like amorphous alloy composite powders were prepared by ball milling the corresponding alloy powders. Their crystallization behaviors are systematically investigated by non-isothermal and isothermal modes. The phase transition during the ball milling would be Cu ₅₁Zr ₁₄→amorphous+Cu ₅₁Zr ₁₄ for Cu ₇₀Zr ₁₅Ti ₁₅, Cu ₅₁Zr ₁₄+Cu→amorphous+Cu+Cu ₅₁Zr ₁₄→amorphous+Cu for Cu ₈₀Zr ₁₀Ti ₁₀, Cu+Cu ₃Ti→amorphous+Cu for Cu ₉₀Zr ₅Ti ₅, respectively. The crystallization temperature increases according to the sequence of Cu ₇₀Zr ₁₅Ti ₁₅, Cu ₈₀Zr ₁₀Ti ₁₀ and Cu ₉₀Zr ₅Ti ₅. The crystallization phases are Cu ₃Ti and Cu for the isothermal crystallized Cu ₇₀Zr ₁₅Ti ₁₅, the nonisothermal and isothermal crystallized Cu ₈₀Zr ₁₀Ti ₁₀, and the nonisothermal crystallized Cu ₉₀Zr ₅Ti ₅. The crystallization phases are Cu ₅₁Zr ₁₄, Cu ₃Ti and Cu for the nonisothermal crystallized Cu ₇₀Zr ₁₅Ti ₁₅, while Cu for the isothermal crystallized Cu ₉₀Zr ₅Ti ₅. The detailed crystallization mechanism of non-isothermal and isothermal modes are discussed.