高能球磨制备Fe-Cu纳米晶过饱和固溶体

Fe-Cu nanocrystalline supersaturated solid solution prepared by high energy ball milling

对Fe-20at%Cu合金粉末进行了高能球磨并利用XRD对Fe-Cu二元合金粉末在球磨过程中的物相变化进行了分析。结果表明,球磨30 h后形成了Fe(Cu)纳米晶过饱和固溶体。热力学计算分析指出,Fe-Cu二元系不具有形成过饱和固溶体的热力学驱动力。高能球磨在Fe-Cu二元互不溶体系中扩展固溶度的驱动力是动力学驱动。在随后的退火过程中纳米晶过饱和固溶体发生分解。

Fe-20at%Cu alloy powder was prepared by high energy ball milling,and the evolution of phase was investigated by X-ray diffractormeter.The result shows that the Fe（Cu） nanocrystalline supersaturated solid solution is prepared after ball milling for 30 h.The thermodynamics calculation result shows that there is no driving force to form solid solution.The driving force for extension of solid solubility in Fe-Cu immiscible system by high energy ball milling comes from the dynamics.In the subsequent annealing process,the nanocrystalline supersaturated solid solution is decomposed.