(1. 广西科学院 高性能新材料产业研究院，南宁 530000；
2. 桂林电子科技大学 材料科学与工程学院，桂林 541004；
3. 中南大学 粉末冶金研究院，长沙 410083)
摘 要: 元素掺杂是改善金属钒的氢溶解度高、易氢脆的有效手段。本文研究了(Pd, Mo)掺杂对钒基固溶体结构和氢渗透性能的影响。结果表明：电弧熔炼制备的V100-xPdx和V100-xPdx/2Mox/2 (x=3.125, 6.25)合金均为具有V-BCC相结构的钒基固溶体，与金属钒相比，(Pd, Mo)掺杂的固溶体有明显的晶格膨胀现象，双掺V93.75Pd3.125Mo3.125固溶体具有最大的晶格膨胀率(0.251%)。掺杂降低了金属钒的氢溶解度，增大了氢化物形成焓，有利于改善金属钒的抗氢脆性能。双掺V100-xPdx/2Mox/2(x=6.25)合金表现出良好的氢渗透综合性能。V93.75Pd3.125Mo3.125合金具有较高的氢扩散系数(6.37×10-10 cm2/s，298 K)，是单掺V93.75Pd6.25合金的5倍多，同时V93.75Pd3.125Mo3.125合金兼具较高的维氏硬度(279.66 HV)。本研究表明，通过合理的掺杂元素和比例选取可对钒基固溶体结构进行调制，进而调控其氢渗透综合性能。
关键字: (Pd, Mo)掺杂；钒基固溶体；氢溶解度；氢扩散系数；抗氢脆性
（1. High-Performance New Material Industry Research Institute, Guangxi Academy of Sciences, Nanning 530000, China;
2. School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;
3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Element doping is an effective means to improve the high hydrogen solubility and hydrogen embrittlement of metal vanadium. In this paper, the effect of (Pd, Mo) doping on the structure and hydrogen permeability of V-based solid solution was studied. The results show that the V100-xPdx and V100-xPdx/2Mox/2 (x=3.125, 6.25) alloys prepared by arc melting are V-based solid solutions with a V-BCC phase structure. Compared with metal V, the (Pd, Mo) doped solid solution has obvious lattice expansion, and the double-doped V93.75Pd3.125Mo3.125 solid solution has the largest lattice expansion rate (0.251%). Doping reduces the hydrogen solubility of metallic vanadium and increases the enthalpy of hydride formation, which is beneficial to improve the hydrogen embrittlement resistance of metallic vanadium. The double-doped V100-xPdx/2Mox/2 (x=6.25) alloy shows good overall hydrogen permeability properties. The V93.75Pd3.125Mo3.125 alloy has a higher hydrogen diffusion coefficient (6.37×10-10cm2/s, 298 K), which is more than 5 times that of single-doped V93.75Pd6.25 alloy, and the V93.75Pd3.125Mo3.125 alloy also has a high Vickers hardness of 279.66 HV. This study confirms that the V-based solid solution structure can be adjusted through a reasonable selection of elements doping and proportions, and then the overall performance of hydrogen permeation can be adjusted.
Key words: (Pd, Mo) doping; V-based solid solution; hydrogen solubility; H-diffusion coefficient; hydrogen embrittlement resistance
