基于Sauer-Freise方法的Co-Mn体系fcc相互扩散系数的研究  

INTERDIFFUSION STUDY ON FCC PHASE OF Co-Mn SYSTEM BASED ON SAUER-FREISE MHTHOD

作　　者：吴雪婷[1] 鲁晓刚[1] 朱娜琼[1] 何燕霖[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072

出　　处：《上海金属》2015年第5期66-69,74,共5页Shanghai Metals

基　　金：国家973计划项目(项目号:2012CB619601)

摘　　要：为了测定Co-Mn二元系fcc相的互扩散系数,实验制备了Co/Co-20at%Mn、Co/Co-32at%Mn和Co/Co-40at%Mn三种扩散偶,分别置于不同温度和时间条件下进行扩散,并采用电子探针显微成分分析(EPMA)得到扩散微区的成分浓度曲线,运用Sauer-Freise方法进而拟合得到互扩散系数。研究表明:本实验得到的扩散系数与日本学者Iijima的实验结果基本一致,但在950℃及1100℃温度下,当Mn含量高于20at%时,两者数据相差较大,故在高Mn区仍需补充扩散实验。In the present research, Co-Mn system was chosen to identify the interdiffusion coefficients of the fee phase. Three diffusion couples, i.e. Co/Co-20at% Mn, Co/Co-32at% Mn and Co/Co-40at%Mn, were prepared at the temperature range between 950 ℃ and 1 100 ℃ for various period of time. EPMA technique was then adopted to determine the concentration profile of each element in the diffusion area. Interdiffusion coefficients of the fcc phase were finally obtained by applying the Sauer-Freise method. Results indicated that interdiffusion coefficients obtained in the present work were partly consistent with Iijima＇ s since there existed significant inconsistency when the content of Mn rose above 20at%. Thus more experiments should be conducted later over the high composition range of Mn.

关 键 词：Co-Mn 扩散偶法 EPMA技术 互扩散系数 Sauer-Freise方法 

分 类 号：TG132.33[一般工业技术—材料科学与工程]