超导金属玻璃Zr_(78)Co_(22)的结晶化动力学研究  

A STUDY ON CRYSTALLIZATION KINETICS OF SUPERCON-DUCTING METALLIC GLASS Zr_(78)Co_(22)

作　　者：周先意[1] 刘治国[2] 朱育平[2] 陈光慧 陈涌[2] 张其瑞[1] 

机构地区：[1]中国科学技术大学物理系 [2]南京大学固体微结构物理实验室和现代分析中心

出　　处：《物理学报》1989年第6期931-937,共7页Acta Physica Sinica

基　　金：南京大学固体微结构实验基金;中国科学院青年奖励基金

摘　　要：综合利用x射线小角散射、广角衍射、场离子显微镜等测量,并结合超导临界温度和显微硬度的观测,研究了金属玻璃Zr_(78)Co_(22)的结构及其结构弛豫和结晶化过程.结果表明,淬态金属玻璃Zr_(78)Co_(22)中存在明显的相分离,其中一个相的组分似乎趋向于纯Zr,另一相的组分则与ZO_4Co 接近.在结构弛豫过程中,主要是拓扑短程序发生了变化,它受成核长大机理支配.当核的数量足够多时,两相均匀一致地长大.The structure, structural relaxation and crystallization of metallic glass Zr78Co22 are investigated by the small angle X-ray diffraction, the wide angle X-ray diffraction and the field ion microscopy, together with the measurements of the superconducting critical temperature and the microhardness. The results indicate that there exists obviously the amorphous phase separation in the as-quenched state of the metallic glass Zr78Co22. The compositions of two segregated amorphous phases are similar to pure Zr and Zr4Co respectively. In the process of structural relaxation, the changes of the toplogical short range order are essential and controlled by the nucleation-growth mechanism. When the number of nucleation is sufficient, the segregation grow homogenously and identically.

关 键 词：超导金属玻璃 结晶动力学 

分 类 号：TM263.014[一般工业技术—材料科学与工程]