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Cu40Ti60-xZr(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.Cu40TixZry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Tx逐渐升高,对非晶粉末在相应的Tx温度附近退火15min后发现,Cu40Ti30Zr30合金没有析出相,Cu40Ti1Zr50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

Cu40Ti60-xZrx(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 Cu40TirZry powders show that the onset crystallization temperature (Tx) 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, Tx. 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.