Ti_3Al基合金中氢扩散动力学研究

The Kinetics of Hydrogen Diffusion in Ti_3Al-based Alloy

本文研究了Ｔｉ－２４Ａｌ－１１Ｎｂ－３Ｖ－１Ｍｏ合金在５００—６５０℃温度范围内的气相充氢过程．结果表明：在一定温度下，合金中的氢浓度随充氢时间的变化呈抛物线关系．通过求解扩散方程，得到氢在合金中的表观扩散激活能为９０．４０ｋＪ／ｍｏｌ．研究还表明合金中的平衡氢浓度与充氢温度有关．

The gaseous hydrogen charging process into a Ti_3Al-based alloy over the temperature range of 500-650℃ was investigated. The results showed that the relationship between the average hydrogen concentration at constant temperature and charging time reveals a parabolic rate law. Based on the solution of diffusion equation, the apparent activation energy of hydrogen diffusion in the alloy was estimated to be 90. 4 kJ/mol. It is found that the equilibrium hydrogen content in the alloy depends on the temperature of the gaseous hydrogen charging process.