氢在Ti-6Al-4V合金中的扩散动力学研究(英文)

Kinetics of Hydrogen Diffusion in Ti-6Al-4V Alloy

用气相充氢法研究了Ti-6Al-4V合金在初始氢气压力为0.012、0.04和0.07 MPa,温度为800、850和900℃条件下充氢过程中的氢扩散动力学。结果表明,在不同的初始氢气压力和充氢温度下,合金中的平均氢浓度随充氢时间的变化呈现指数关系,由此可见Ti-6Al-4V合金的充氢过程受氢原子的扩散所控制。通过求解扩散方程得到,氢在Ti-6Al-4V合金中的表观扩散激活能为32.80 kJ/mol,此激活能为氢在Ti-6Al-4V合金相中的扩散激活能。

The diffusion kinetics of hydrogen in Ti-6Al-4V alloy was investigated by the gaseous hydrogen charging at the initial hydrogen pressures of 0.012, 0.04 and 0.07 MPa and the temperatures of 800, 850 and 900 oC. The results show the variation of the average hydrogen concentration in the alloy with hydrogen charging time exhibits an exponential characteristic relationship at different initial hydrogen pressures or hydrogen charging temperatures. The hydrogen charging process is controlled by the diffusion of hydrogen atoms in Ti-6Al-4V alloy. Based on the solution of diffusion equation, the apparent activation energy of hydrogen diffusion in Ti-6Al-4V alloy is estimated to be 32.80 kJ /mol. This energy is the activation energy of hydrogen diffusion in phase of Ti-6Al-4V alloy.