(1. 桂林电子科技大学 材料科学与工程学院，桂林 541004；
2. 哈尔滨工业大学 材料科学与工程学院，哈尔滨 150001；
3. 三峡大学 机械与动力学院，宜昌 443002)
摘 要: 系统研究Nb-Ti-Co三元合金系富Nb角相区渗氢成分区域内27种合金(膜)在523~673 K下的渗氢性能，并与Nb-Ti-Ni合金和纯Pd进行比较；而后分析区域内代表性合金(18#, 17#, 25#, 24#和33#)的持久性能、氢溶解和氢扩散特性，并结合“电阻模型”详细探讨Nb-Ti-Co合金(膜)的渗氢和抗氢脆机理。结果表明：在原有渗氢成分区域内排除六种氢脆合金后，重构渗氢区域，即区域III''''，该区域内18#合金(Nb65Ti20Co15)在673 K下具有最大的渗氢系数，为4.12×10-8 mol/(m·s·Pa1/2)，其余合金按照渗氢系数高低(取前三)的排列顺序依次为17#、25#和24#，三者渗氢系数分别为3.99×10-8、3.72×10-8和3.58×10-8 mol/(m·s·Pa1/2)；区域内33#、24#和18#合金的氢溶解和氢扩散系数依次增加，18#合金的氢溶解和氢扩散系数为15.6 mol/(m3·Pa0.5)和26.4×10-10 m2/s，分别是33#合金的1.16和1.35倍；区域III′内合金渗氢系数的增加(Ф18#＞Ф24#＞Ф33#)归结于同时增大的氢溶解和扩散系数，但后者起主要作用，18#合金的氢扩散激活能较低，氢原子容易跃迁，因此，该合金具有相对较高的氢扩散系数。
关键字: Nb-Ti-Co合金；氢渗透；氢溶解；氢扩散
（1. School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;
2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
3. College of Mechanical and Power Engineering, Three Gorges University, Yichang 443002, China）
Abstract:The hydrogen permeability of 27 kinds of alloys in the hydrogen permeable component region of Nb-Ti-Co alloy system was studied in the region of 523-673 K, and compared with Nb-Ti-Ni and pure Pd. And then the durable performance, hydrogen dissolution and diffusion behaviors of typical alloys in the above component region were analyzed. The hydrogen permeable and anti-hydrogen brittleness mechanisms were also discussed by using the resistance model and the hydrogen dissolved model. The results show that after removing 6 hydrogen embrittlement alloys in original hydrogen permeable component region, an new component region was constructed, i.e., the region III''''. 18# alloy in the region III′ possesses the highest hydrogen permeability with 4.12×10-8 mol/(m·s·Pa1/2) at 673 K. The hydrogen permeability of the remaining alloys is listed in the order as follows: 17# (3.99×10-8 mol/(m·s·Pa1/2)), 25# (3.72×10-8 mol/(m·s·Pa1/2)) and 24# (3.58×10-8 mol/(m·s·Pa1/2)). The hydrogen dissolution and diffusion coefficients of 33#, 24# and 18# alloys in the region III'''' increase in sequence. The hydrogen dissolution and diffusion coefficients of 18# alloy are 15.6 mol/(m3·Pa0.5) and 26.4×10-10 m2/s, which are 1.16 and 1.35 times larger than those of 33# alloy. The increase of hydrogen permeability in the region III''''(Ф18#＞Ф24#＞Ф33#) can be attributed to the simultaneous increment of hydrogen dissolution and diffusion coefficient, but the later plays a key role. The hydrogen diffusion activation energy of 18# alloy is low and the hydrogen atoms are easy to jump. Therefore, this alloy has relatively high hydrogen diffusion coefficient.
Key words: Nb-Ti-Co alloy; hydrogen permeation; hydrogen dissolution; hydrogen diffusion
