(1.太原理工大學 表面工程研究所，太原 030024；
2.平朔煤炭公司設計院，朔州 038506)
摘 要: 研究采用雙層輝光離子滲金屬技術在Ti-6Al-4V合金表面制備Mo基改性層的Mo擴散過程。通過觀察滲層截面組織形貌，測定各種合金化元素的分布情況，著重分析不同溫度下不同元素的加入對Mo擴散行為的影響。結果表明：在800~950 ℃下，Ti-6Al-4V合金離子滲Mo后所得改性層厚度、Mo平均擴散系數(shù)及相同濃度下Mo的擴散系數(shù)都隨溫度升高而升高；由于反濺射和Ti-6Al-4V基體相變等原因，1 000 ℃時各參數(shù)反常；加入合金元素W和N使Mo的擴散系數(shù)有所降低，Mo的平均擴散系數(shù)在單純滲Mo時為2.376 88×10−4，W-Mo共滲時為1.471 27×10−4，W-Mo-N共滲時為7.026 81×10−5。
關鍵字: Ti-6Al-4V；鉬；雙輝離子滲金屬技術；擴散系數(shù)
Ti-6Al-4V by plasma surface alloying technique
（1. Surface Engineering Institute, Taiyuan University of Technology, Taiyuan 030024, China;
2. Pingshuo Coal Company Design Institute, Shuozhou 038506, China）
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.
Key words: Ti-6Al-4V; molybdenum; double glow plasma surface alloying; diffusion coefficient
