Ti-6Al-4V表面等离子合金层中渗Mo的扩散系数

来源期刊:中国有色金属学报2010年第6期

论文作者:李哲 秦林 马连军 范爱兰 张万祯 唐宾

文章页码:1137 - 1142

关键词:Ti-6Al-4V;钼;双辉离子渗金属技术;扩散系数

Key words:Ti-6Al-4V; molybdenum; double glow plasma surface alloying; diffusion coefficient

摘    要:研究采用双层辉光离子渗金属技术在Ti-6Al-4V合金表面制备Mo基改性层的Mo扩散过程。通过观察渗层截面组织形貌,测定各种合金化元素的分布情况,着重分析不同温度下不同元素的加入对Mo扩散行为的影响。结果表明:在800~950 ℃下,Ti-6Al-4V合金离子渗Mo后所得改性层厚度、Mo平均扩散系数及相同浓度下Mo的扩散系数都随温度升高而升高;由于反溅射和Ti-6Al-4V基体相变等原因,1 000 ℃时各参数反常;加入合金元素W和N使Mo的扩散系数有所降低,Mo的平均扩散系数在单纯渗Mo时为2.376 88×10-4,W-Mo共渗时为1.471 27×10-4,W-Mo-N共渗时为7.026 81×10-5

Abstract: The molybdenum-based alloying layers on the surface of Ti-6Al-4V were prepared by a plasma surface alloying process. The microstructure and element distribution of the modified layers were examined. The diffuse process and the impact of temperature and alloying elements to diffusion coefficients of Mo (DMo) were studied. The results show that the depth of the molybdenum alloying layers, the mean diffusion coefficients of Mo ( ) and the DMo at the same Mo concentration increase with increasing temperature in the rang of 800-950 ℃, while they are abnormal at 1 000 ℃ for the comprehensive influence of sputter and phase transition of the Ti6Al4V sample. Addition of tungsten and nitrogen reduces the DMo in different degrees, and values for alloying layers with Mo, W-Mo and W-Mo-N are 2.376 88×10-4, 1.471 27×10-4 and 7.026 81×10-5 , respectively.

基金信息:国家高技术研究发展计划资助项目
国家自然科学基金资助项目
山西省青年科学基金资助项目

有色金属在线官网  |   会议  |   在线投稿  |   购买纸书  |   科技图书馆

中南大学出版社 技术支持 版权声明   电话:0731-88830515 88830516   传真:0731-88710482   Email:administrator@cnnmol.com

互联网出版许可证:(署)网出证(京)字第342号   京ICP备17050991号-6      京公网安备11010802042557号