TiHf合金吸氘动力学行为研究

Correlation Between Eutectoid Phase Transition and Deuteration Kinetics of TiHf Alloys

采用恒容变压法研究了系列组分钛铪合金TiHfx(x=0.13、0.26、0.52)和Hf在相同初压、473K^873K温度下的吸氘动力学行为,获得了吸氘量与吸氘时间的关系,分析了影响动力学行为的因素。在473K^873K温度范围内,TiHfx合金吸氘曲线在高温和低温下具有两种不同的特征,揭示了不同的反应机制。在673K以上,TiHfx吸氘经历α→β相变过程,而673K以下的吸氘过程为α→δ相变。结果可见,TiHfx-D体系的共析相变温度在673K附近,随Hf含量增加,共析相变温度升高。

Using a method of constant volume and alterable pressure, deuteration kinetics of TiHfx （x=0.13, 0.26, 0.52） alloys and Hf were studied at the same initial pressures and in the temperature range of 473 to 873 K. The correlation of decrease of deuterium pressure with time was attained by the experiment of alloys absorbing deuterium. According to the results, the main factors that decide kinetics of Ti-Hf alloys absorbing deuterium were put forward and discussed. In the temperature range of 473 to 873 K, the deuteration curves of Ti-Hf alloys present two distinct figure in the higher or lower temperature region, which implies dissimilar reaction mechanism. Above 673 K, the α→β phase transition take place when Ti-Hf alloys react with deuterium gas. But that will be a α→δ phase transition as the temperature below 673 K. Thereby, it will be confirmed that the eutectoid phase transition