Nb-Ti-Ni体系合金的结构及其氢渗透性能
来源期刊：中南大学学报(自然科学版)2012年第9期
论文作者：刘菲 王仲民 黄贺伟 邓健秋 周怀营
文章页码：3401 - 3407
关键词：Nb-Ti-Ni；氢扩散系数；bcc-Nb(Ni,Ti)固溶体；共晶相
Key words：Nb-Ni-Ti; hydrogen diffusion coefficient; bcc-Nb(Ni,Ti) solid solution; eutectic phase
摘 要：以Ni30Ti31Nb39为成分基点，通过合金成分的规律性调整(5%，原子数分数)，研究系列Nb-Ti-Ni体系合金的相结构与氢渗透性能。研究结果表明：制备的Nb-Ti-Ni合金有两相和三相共2种相结构；两相合金由bcc-Nb(Ni,Ti)固溶体和(bcc-Nb(Ni,Ti)+β2-NiTi)共晶相构成；三相合金除上述两相外，还有少量NiTi2相；两相结构合金的氢渗透性能优于三相结构合金性能，合金中Nb含量越多，bcc-Nb(Ni,Ti)固溶体相含量越大，合金的氢扩散系数(D)增大；Ni和Ti含量增大，则降低了固溶体相的比例，不利于合金氢扩散性能提高；Nb-Ti-Ni体系合金的氢扩散系数为10-9数量级，Nb49Ni25Ti26合金的氢扩散系数最大(5.260 5×10-9 m2/s)。
Abstract: Effect of composition, phase ratio of Nb-Ni-Ti alloys on its hydrogen diffusion properties was investigated, where the composition of Ni30Ti31Nb39 was the original one, the alloy composition was adjusted at 5% (mole fraction). Hydrogen diffusion coefficient (D) was measured in Devanathan-Stachurski (D-S) dual-cell system. The results indicate that these alloys are two-phase structure, or three-phase structure, consisting of the primary bcc-Nb (Ni,Ti) solid solution phase, (bcc-Nb(Ni, Ti)+β2-NiTi) eutectic phase, and a small amount of NiTi2 phase (observed in three-phase alloy). Two-phase alloys show better hydrogen diffusion properties than three-phase alloys, the increase of Nb content will lead to a higher percent of bcc-Nb(Ni, Ti) solid solution phase, and then a higher value of D increase; while the increase of Ni and Ti content will result in a lower value of D due to the decrease of the percentage of solid solution. Hydrogen diffusion coefficient (D) of these samples reaches the magnitude of 10-9 m2/s, the max value (5.2605×10-9 m2/s) is observed in the case of Nb49Ni25Ti26 alloy.
刘菲1, 2，王仲民1，黄贺伟1，邓健秋1，周怀营1
(1. 桂林电子科技大学 材料科学与工程学院，广西 桂林，541004；
2. 太原工业学院 材料工程系，山西 太原，030008)
摘 要：以Ni30Ti31Nb39为成分基点，通过合金成分的规律性调整(5%，原子数分数)，研究系列Nb-Ti-Ni体系合金的相结构与氢渗透性能。研究结果表明：制备的Nb-Ti-Ni合金有两相和三相共2种相结构；两相合金由bcc-Nb(Ni,Ti)固溶体和(bcc-Nb(Ni,Ti)+β2-NiTi)共晶相构成；三相合金除上述两相外，还有少量NiTi2相；两相结构合金的氢渗透性能优于三相结构合金性能，合金中Nb含量越多，bcc-Nb(Ni,Ti)固溶体相含量越大，合金的氢扩散系数(D)增大；Ni和Ti含量增大，则降低了固溶体相的比例，不利于合金氢扩散性能提高；Nb-Ti-Ni体系合金的氢扩散系数为10-9数量级，Nb49Ni25Ti26合金的氢扩散系数最大(5.260 5×10-9 m2/s)。
关键词：Nb-Ti-Ni；氢扩散系数；bcc-Nb(Ni,Ti)固溶体；共晶相
LIU Fei1, 2, WANG Zhong-min1, HUANG He-wei1, DENG Jian-qiu1, ZHOU Huai-ying1
(1. School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;
2. Department of Materials Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China)
Abstract:Effect of composition, phase ratio of Nb-Ni-Ti alloys on its hydrogen diffusion properties was investigated, where the composition of Ni30Ti31Nb39 was the original one, the alloy composition was adjusted at 5% (mole fraction). Hydrogen diffusion coefficient (D) was measured in Devanathan-Stachurski (D-S) dual-cell system. The results indicate that these alloys are two-phase structure, or three-phase structure, consisting of the primary bcc-Nb (Ni,Ti) solid solution phase, (bcc-Nb(Ni, Ti)+β2-NiTi) eutectic phase, and a small amount of NiTi2 phase (observed in three-phase alloy). Two-phase alloys show better hydrogen diffusion properties than three-phase alloys, the increase of Nb content will lead to a higher percent of bcc-Nb(Ni, Ti) solid solution phase, and then a higher value of D increase; while the increase of Ni and Ti content will result in a lower value of D due to the decrease of the percentage of solid solution. Hydrogen diffusion coefficient (D) of these samples reaches the magnitude of 10-9 m2/s, the max value (5.2605×10-9 m2/s) is observed in the case of Nb49Ni25Ti26 alloy.
Key words:Nb-Ni-Ti; hydrogen diffusion coefficient; bcc-Nb(Ni,Ti) solid solution; eutectic phase
