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利用X射线衍射技术、差示扫描量热分析技术和透射电子显微镜研究了非晶态Cu56 Zr4 4合金的结构及其等温退火条件下的晶化过程 .实验结果表明 ,非晶态Cu56 Zr4 4合金在室温下的短程结构类似于硬球无规密堆积分布 .在70 3K过冷液相区内等温退火时发现 ,当退火时间为 3min时 ,晶化产物主要为Cu8Zr3相 ;当退火时间为 6min时 ,Cu8Zr3相完全消失 ,而Cu1 0 Zr7相大量析出 ;当退火时间达到 3 0min以上时 ,其晶化产物转变为Cu1 0 Zr7,CuZr2 ,Cu8Zr3等多种化合物 .由此提出了非晶态Cu56 Zr4 4合金等温退火晶化过程的扩散机理 .
The structure of amorphous Cu56 Zr4 4 alloy and its crystallization process under isothermal annealing were studied by means of X-ray diffraction, differential scanning calorimetry and transmission electron microscopy.The experimental results show that the amorphous Cu56 Zr4 4 alloy The short-range structure at room temperature is similar to the random packing of hard-balls. When isothermal annealing in the subcooled region of 70 3 K, it is found that when the annealing time is 3 min, the product of crystallization is mainly Cu 8 Zr 3 phase. When the annealing time is 6 min , The Cu8Zr3 phase completely disappeared while the Cu1 0 Zr7 phase precipitated in a large amount. When the annealing time reaches more than 30min, the crystallized product is transformed into many compounds such as Cu1Zr7, CuZr2, Cu8Zr3, etc. Thus, the amorphous Cu56Zr4 4 alloy isothermal annealing crystallization process of diffusion mechanism.