(Pd,Mo)掺杂对钒基固溶体结构和氢渗透性能的影响  

Effects of(Pd,Mo)doping on structure and hydrogen permeation properties of V solid solutions

作　　者：王仲民 吴晨曦[1,2] 张艳丽 龙乾新[2] 王凤 乔涛[1] 黄志民 杜勇 WANG Zhong-min;WUChen-xi;ZHANG Yan-li;LONG Qian-xin;WANG Feng;QIAO Tao;HUANG Zhi-min;DU Yong(High-Performance New Material Industry Research Institute,Guangxi Academy of Sciences,Nanning 530000,China;School of Materials Science and Engineering,Guilin University of Electronic Technology,Guilin 541004,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[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

出　　处：《中国有色金属学报》2022年第9期2680-2690,共11页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51961010,51861006);广西科技计划资助项目(桂科AB182810103);广西科技基地和人才专项(桂科AD19110010);广西信息材料重点实验室资助项目(211028-Z)。

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V_(100−x)Pd_(x)和V_(100−x)Pd_(x/2)Mo_(x/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V_(93.75)Pd_(3.125)Mo_(3.125)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V_(100−x)Pd_(x/2)Mo_(x/2)(x=6.25)合金表现出良好的氢渗透综合性能。V_(93.75)Pd_(3.125)Mo_(3.125)合金具有较高的氢扩散系数(6.37×10^(−10) cm^(2)/s,298 K),是单掺V_(93.75)Pd_(6.25)合金的5倍多,同时V_(93.75)Pd_(3.125)Mo_(3.125)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。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 V_(100−x)Pd_(x) and V_(100−x)Pd_(x/2)Mo_(x/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 V_(93.75)Pd_(3.125)Mo_(3.125) 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 V_(100−x)Pd_(x/2)Mo_(x/2)(x=6.25)alloy shows good overall hydrogen permeability properties.The V_(93.75)Pd_(3.125)Mo_(3.125) alloy has a higher hydrogen diffusion coefficient(6.37×10^(−10) cm^(2)/s,298 K),which is more than 5 times that of single-doped V_(93.75)Pd_(6.25) alloy,and the V_(93.75)Pd_(3.125)Mo_(3.125) 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.

关 键 词：(Pd Mo)掺杂 钒基固溶体 氢溶解度 氢扩散系数 抗氢脆性 

分 类 号：TB31[一般工业技术—材料科学与工程] TK91[动力工程及工程热物理]