机械合金化法制备Cu-Ti-Zr基非晶合金

采用机械合金化法成功制备Cu₄₀Ti_60-xZr_x(x=0,10,30,50)非晶合金.研究Cu-Ti-Zr合金粉末由晶态向非晶态转变过程中的组织结构变化,探讨非晶合金的形成机制,以及非晶合金的热稳定性和晶化产物.结果表明,非晶合金直接从初始元素得到,在反应过程中没有金属间化合物出现,非晶化过程可以由间隙扩散模型来解释.Cu₄₀Ti_xZr_y非晶粉末的DSC分析表明,随着Ti含量的降低和Zr含量的升高,非晶粉末的晶化温度T_x逐渐升高,对非晶粉末在相应的T_x温度附近退火15min后发现,Cu₄₀Ti₃₀Zr₃₀合金没有析出相,Cu₄₀Ti₁₀Zr₅₀析出了Zr₂Cu,Cu₄Ti和少量的一些未知相.

Fabrication of Cu-Ti-Zr Based Amorphous Alloys by Mechanical Alloying

Cu₄₀Ti_60-xZr_x (x = 0,10,30,50) amorphous alloys were fabricated successfully by using mechanical alloying method. The mechanism of amorphization was discussed by investigating the transformation of Cu-Ti-Zr alloy powders from crystallization to amorphous state in the process of mechanical alloying. The thermal stability and crystalline phase of amorphous alloys were also investigated. It is shown that the amorphous is formed from the original elements directly, and no metallic compounds appear in the solid-state reaction. The amorphization mechanism may be explained by the vacancy diffusion model. The DSC traces of fully amorphous Cu₄₀Ti_xZr_y powders show that the onset crystallization temperature (T_x) is increased with the decrease of Ti content and the increase of Zr content. The Cu₄₀Ti₃₀Zr₃₀ and Cu₄₀Ti₁₀Zr₅₀ amorphous alloys were annealed near the onset crystallization temperature, T_x. It is found that Zr₂Cu, Cu₄Ti and a little unidentified crystal phases were precipitated in the Cu₄₀Ti₁₀Zr₅₀ amorphous alloy after annealed for 15 min, whereas there were no precipitates in the Cu₄₀Ti₃₀Zr₃₀ amorphous alloy.