The Interfacial Defective Structure and Mechanical Property of Nanocrystalline Fe-based Alloys  

作　　者：刘学东 朱洁 姜健 胡状麒 

机构地区：[1]State Key Lab of RSA, Institute of Metal Research, Academia Sinica, Shenyang 110015, PRC [2]International Center for Materials Physics,Academia Sinica,Shenyang 11015,PRC [3]Institute of Metal Research,Academia Sinica,Shenyang 11015,PRC

出　　处：《Chinese Science Bulletin》1994年第14期1228-1230,共3页

摘　　要：Positron lifetime results showed that there are two kinds of interfacial defects in the nanocrystalline alloys obtained by crystallization of the amorphous alloy, namely free-volume-sized and nanovoid-sized defects. The former is smaller than a monovacancy; the latter is of the size of several monovacancies and is usually situated at the intersections of several interfaces. In comparison with the nanovoid-sized defect, though the free-volume-sized defect is a shallow trapping potential, the quantity can be as much as 90% of all defects. It should be noted that nanovoids can change remarkably in both size and concentration with grain growth. So it is imaginable that this type of defect will exert a great influence on the interfacial structure and properties of nanocrystalline materials. So far, reports in this aspect are still meager.

关 键 词：crystallization NANOCRYSTALLINE alloy POSITRON ANNIHILATION microhardness. 

分 类 号：TB383[一般工业技术—材料科学与工程]