摘要
应用ＴＥＭ，ＸＲＤ，ＤＳＣ等实验手段研究了不互溶Ｌａ－Ｆｅ元素混和粉（原子比Ｌａ∶Ｆｅ＝１∶５）机械合金化（ＭＡ）过程和微观结构．研究表明两元素之间无明显固态反应．在球磨作用下β－Ｌａ首先向α－Ｌａ转变，５５ｈ后形成非晶Ｌａ．同时Ｆｅ细化成纳米晶，形成纳米晶Ｆｅ和非晶Ｌａ的复合结构．非晶Ｌａ分布在纳米Ｆｅ晶粒之间，使Ｆｅ晶粒具有很好的热稳定性．
By the use of TEM, XRD, DSC, mechanical alloying of immicieble La Fe system (atomic ratio La∶Fe=1∶5) is investigated. The results show that the two elementes don′t react with each other in La+Fe blended element powder during ball milling. The β La firstly transforms into α La, and forms amorphous La after 55 hours milling. At the same time Fe forms nano sized grains with amorphous La distributed between Fe grains, and due to this struction the nano sized Fe grains possess good thermostability. The theory of atom size model can partially explain the experimental results.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
1997年第2期58-62,共5页
Acta Scientiarum Naturalium Universitatis Sunyatseni
