纯铁在稀土与氮离子共渗后的表层结构  

SURFACE LAYER STRUCTURE OF PURE IRON TREATED BY ION-RE-NITRIDATION

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7期705-710,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金

摘　　要：采用辉光放电离子溅射法成功地将稀土元素Ｃｅ，Ｌａ和氮元素以较高浓度渗入纯铁．使用金相、电子探针及透射电子显微镜（ＴＥＭ和ＨＲＴＥＭ）等实验方法对试样进行了分析．结果表明，由于稀土元素的作用，在渗层暗区以下使氮元素主要以不完全６Ｈ类型的高层结构间隙相γ＇（Ｆｅ_４Ｎ）的形式存在，并与基体间近似符合Ｋ－Ｓ关系，界面共格较好．与仅渗氮样品的对比表明，稀土元素明显促进氮元素的渗入并促使氮元素分布曲线峰值向Ｆｅ基体内部推移．除以上作用外，稀土元素还在α－Ｆｅ中生成金属间化合物（Ｃｅ，Ｌａ）Ｆｅ。An investigation has been made on the microstructure of the surface layer in pure iron ion-nitrided with RE(rare earth) ions (Ce￣+, La￣+). Analysis by EPMA shows that the peak value of distribution of nitrogen element inside the pure iron with ion RE-nitridation is about 100 μm deeper than that with ion nitridation. Investigations by SAED and HRTEM show that the γ'(Fe_4N) phase exists as the uncomplete 6H type long period structure due to the effect of RE elements. There is a near K-S orientation relationship between a-Fe and γ' phase. The RE elements also exist as intermetallic compound (Ce, La)Fe_7which has approximate orientation relationship with α-Fe as follows: Correspondent: WU Yaqiao, Laboratory of Aiomic Imaging of Solids, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015

关 键 词：纯铁 稀土元素 氮元素 离子共渗 内表层 结构 

分 类 号：TG156.8[金属学及工艺—热处理]