纯铁离子渗稀土表层结构研究  

A STRUCTURAL OBSERVATION ON IONIZED RE METALLIZING LAYER OF PURE IRON

作　　者：吴亚桥[1] 杨林[1] 赵忠俭[1] 高丽峰[1] 徐永波[1] 吕振家[1] 

机构地区：[1]沈阳工业大学,中国科学院金属研究所固体原子像开放实验室,中国科学院金属研究所疲劳与断裂国家重点实验室

出　　处：《金属学报》1996年第6期594-598,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金

摘　　要：本文利用辉光放电离子溅射法成功地将稀土元素Ｌａ，Ｃｅ离子化，并以较高的浓度渗入纯铁．采用金相、电子探针、能谱（ＥＤＡＸ）及透射电镜（ＴＥＭ）等方法研究了被渗试样的渗层结构，确定出稀土元素在纯铁中的两种存在形式：固溶和亚稳的金属间化合物（Ｃｅ，Ｌａ）Ｆｅ_７，选区电子衍射证明，ＣｅＦｅ_７与α－Ｆｅ之间存在如下取向关系（０１１）α－Ｆｅ∥（１１０）ＣｅＦｅ７，［１１１］α－Ｆｅ∥［００１］ＣｅＦｅ７．观察表明，稀土元素原子的渗入可促使铁基体中固溶的微量碳原子向试样外表面扩散并偏聚．Ce and La atoms were successfully metallized on pure iron by using glow discharge method. The structural observation of the surface layer showed that there are three kinds of layers below surface, i.e, solid solution, penetrating and transition. Analysis by EPMA and TEM shows that RE elements exist as intermetallic compound (Ce, La)Fe_7 and solute in α-Fe solid solution. The trace carbon atoms soluted in α-Fe may diffuse towards to the surface and segregate under surface layer of the specimen. Investigations by SAED and HRLM show that a preferred orientation relationship between α-Fe and (Ce,La)Fe7 is as follows: (011)α-Fe∥(110)CeFe7,[111] α-Fe∥[001]CeFe7.

关 键 词：纯铁 稀土元素 离子渗 表层结构 

分 类 号：TG156.8[金属学及工艺—热处理]