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，与基体间有如下近似取向关系
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
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | 余景生,余宗森．见:余宗森主编,稀土在钢铁中的应用,北京:冶金工业出版社,1987:12 吕振家,吕其岗．见:余宗森主编．稀土在钢铁中的应用,北京:冶金工业出版社,1987:3603 孙东升,李凤照,张保荣．金属热处理学报,1992,9:464 GerardinD．MenMemSciRev,Metall．1977 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%