(1. 廣西科學院 高性能新材料產(chǎn)業(yè)研究院，南寧 530000；
2. 桂林電子科技大學 材料科學與工程學院，桂林 541004；
3. 中南大學 粉末冶金研究院，長沙 410083)
摘 要: 元素摻雜是改善金屬釩的氫溶解度高、易氫脆的有效手段。本文研究了(Pd, Mo)摻雜對釩基固溶體結(jié)構(gòu)和氫滲透性能的影響。結(jié)果表明：電弧熔煉制備的V100-xPdx和V100-xPdx/2Mox/2 (x=3.125, 6.25)合金均為具有V-BCC相結(jié)構(gòu)的釩基固溶體，與金屬釩相比，(Pd, Mo)摻雜的固溶體有明顯的晶格膨脹現(xiàn)象，雙摻V93.75Pd3.125Mo3.125固溶體具有最大的晶格膨脹率(0.251%)。摻雜降低了金屬釩的氫溶解度，增大了氫化物形成焓，有利于改善金屬釩的抗氫脆性能。雙摻V100-xPdx/2Mox/2(x=6.25)合金表現(xiàn)出良好的氫滲透綜合性能。V93.75Pd3.125Mo3.125合金具有較高的氫擴散系數(shù)(6.37×10-10 cm2/s，298 K)，是單摻V93.75Pd6.25合金的5倍多，同時V93.75Pd3.125Mo3.125合金兼具較高的維氏硬度(279.66 HV)。本研究表明，通過合理的摻雜元素和比例選取可對釩基固溶體結(jié)構(gòu)進行調(diào)制，進而調(diào)控其氫滲透綜合性能。
關鍵字: (Pd, Mo)摻雜；釩基固溶體；氫溶解度；氫擴散系數(shù)；抗氫脆性
（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
