U-2.5%Nb合金氢化物生长动力学研究

• 作 者: 李瑞文 汪小琳
• 机 构: 中国工程物理研究院,
• 出 处: 稀有金属材料与工程
• 发表日期: 2014年07期
• 关键词: 氢化 U-2.5%Nb 合金 生长速度 氢化反应 显微镜研究 Arrhenius 激活能 线性关系 显微镜

为了探讨U-2.5%Nb(质量分数)合金的氢腐蚀行为,利用在线显微镜研究了U-2.5%Nb合金氢蚀初期氢化物的生长动力学,研究了U-2.5%Nb合金氢化初期的氢化物形貌、生长速度、氢化反应速度等之间关系。结果表明,利用在线显微镜表征氢化物的生长速度是可行的,氢化物前沿推进距离与时间呈线性关系。在一定温度范围内,氢化物的生长速度与反应温度符合Arrhenius关系,U-2.5%Nb合金氢化物生长激活能为24.34 kJ/mol。当温度增加到125℃附近时,氢化物的生长速度达到最大值,之后,随着反应温度的升高,生长速度快速下降。

In order to investigate the hydrogen corrosion behavior of U-2.5% Nb (mass fraction) alloy, the growth kinetics of initial hydrogenation of U-2.5% Nb alloy at initial hydrogenation was studied by using an in-line microscope. Morphology, growth rate, hydrogenation reaction rate and so on. The results show that the use of online microscopy characterization of hydride growth rate is feasible, hydride front advancing distance and time was a linear relationship. In a certain temperature range, the growth rate of hydride and the reaction temperature accord with Arrhenius relation, and the growth activation energy of U-2.5% Nb alloy hydride is 24.34 kJ / mol. When the temperature is increased to around 125 ° C, the maximum growth rate of the hydride is reached, and thereafter, the growth rate decreases rapidly as the reaction temperature increases.