Ti600合金吸氢的动力学特性

Kinetics of Hydrogen Absorption of Ti600 Alloy

摘要:

采用定容变压法测定不同初始氢分压下Ti600合金的吸氢动力学特性，研究不同氢含量下的微观组织。结果表明，随着氢含量的增加，初生α相和β相的形状、大小、分布及两相的比例均发生变化，Ti600合金的微观组织变得模糊，α相与β相相界模糊。Ti600合金在750 ℃下置氢时，吸氢过程只表现为第2吸氢阶段。在初始吸氢阶段，其Avrami指数n＞1，表现为多级反应；充氢结束后200 s时，氢化反应的Avrami指数n接近1，说明氢在合金内的扩散是氢化反应的速率控制步骤

Abstract:

The kinetics of hydrogen absorption for Ti600 alloy is studied at different initial hydrogen pressures using a constant volume method. The microstructure of hydrogenated Ti600 alloy at different hydrogen contents is observed. It is found that the shape, size, distribution and ratio between primary α phase and β phase change and the microstructure of hydrogenated Ti600 alloy and the phase boundary become ambiguous. The hydrogen absorption process represents only the second stage for the Ti600 alloy during hydrogenating at 750 ℃. The hydrogenating reaction represents multilevel reaction with the Avrami index of n>1 for the initial stage. The Avrami indices reach 1 after hydrogen absorption for 200 s, which illustrate that the rate limit of hydrogenating reaction is due to the diffusion of hydrogen in alloy