(1. 西北工業(yè)大學(xué) 凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室，西安 710072；
2. 西北有色金屬研究院 鈦合金研究所，西安 710016；
3. Apartment of Materials Science and Engineering, The Ohio State University, Columbus 4321011, USA)
摘 要: 將Ti-Mo純金屬組成擴(kuò)散偶，在950~1 050 ℃間研究Ti-Mo二元合金在β相區(qū)的互擴(kuò)散行為。利用電子探針(EPMA)測(cè)定Ti-Mo擴(kuò)散偶在擴(kuò)散區(qū)中Mo元素濃度，建立濃度變化曲線，根據(jù)濃度曲線用Den Broeder方法計(jì)算該擴(kuò)散偶在β相區(qū)的互擴(kuò)散系數(shù)，用Hall方法計(jì)算富Mo側(cè)和富Ti側(cè)的互擴(kuò)散系數(shù)。結(jié)果表明：互擴(kuò)散系數(shù)與濃度之間存在較強(qiáng)烈的依賴關(guān)系；雜質(zhì)擴(kuò)散系數(shù)可通過Vignes-Birchenall公式獲得，并與Hall方法獲得的結(jié)果進(jìn)行比較，這兩種方法得到的結(jié)果比較接近；采用Arrhenius方程獲得不同濃度下的擴(kuò)散激活能和頻率因子，二者的峰值均出現(xiàn)在Mo摩爾濃度約為35%處。
關(guān)鍵字: Ti-Mo擴(kuò)散偶；互擴(kuò)散；雜質(zhì)擴(kuò)散；擴(kuò)散激活能；頻率因子
（1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;
2. Titanium Alloy Research Center, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China;
3. Apartment of Materials Science and Engineering, The Ohio State University, Columbus 4321011, USA）
Abstract:The interdiffusion behavior of Ti-Mo binary system in the β-phase was investigated in the temperature range of 950−1 050 ℃ by using Ti-Mo binary system as diffusion couple. The interdiffusion coefficients were calculated with Den Broeder’s method from the concentration profiles of Mo element determined by EPMA. The Hall method was used to determine the interdiffusion coefficients at the Ti-rich and Zr-rich sides. The results show that the interdiffusion coefficients depend strongly on the concentration. These coefficients are compared with the impurity diffusion coefficients which are determined by Vignes-Birchenall equation. The activation energy and frequency factor were calculated by Arrhenius equation at different concentrations, the maximum values of the two parameters appear at y(Mo)≈35%.
Key words: Ti-Mo diffusion couple; interdiffusion; impurity diffusion; activation energy; frequency factor
