摘要
Nb-Ti-Fe滤氢合金膜具有高的氢渗透性能和价格较低的优势而受到广泛关注。然而,截至目前,关于该合金膜耐腐蚀性能的研究较少有人报道,合金组织和耐腐蚀性能之间的关系尚未建立。基于此,本工作对Nb-Ti-Fe氢分离合金的显微组织、耐腐蚀性能和置氢前后显微硬度开展了一系列研究。研究结果表明:Nb_(10)Ti_(50+x)Fe_(40-x)和Nb_(15)Ti_(45+x)Fe_(40-x)(x=0,5,10,15)两组合金中,当x<10,合金显微组织由初生α-Nb相和共晶(α-Nb+TiFe)相构成,当x>10,合金显微组织中初生相为TiFe相。当x=10时,少量的初生α-Nb相存在于Nb_(10)Ti_(60)Fe_(30)中,但该相在Nb_(15)Ti_(55)Fe_(30)合金中消失,取而代之的是共晶(α-Nb+TiFe)相。其次,上述合金经电化学腐蚀后,表面生成一层极薄的氧化物覆盖层,组分为Nb_(2)O_(5)、TiO_(2)、Nb_(2)C和Fe_(2)O_(3),腐蚀性能与相种类、成分紧密相关,Nb_(10)Ti_(65)Fe_(2)5合金(4#)的耐腐蚀性能较强,含有FeNb相较多的Nb_(15)Ti_(45)Fe_(40)合金(5#)耐腐蚀性能最低。另外,上述合金的置氢性能随着Ti/Fe原子比的增加而逐渐提高,相反,其维氏硬度值先降低而后增加,合金的平均硬度值分布在520HV~570HV之间,且组织中各相显微硬度值排列顺序由小到大为共晶(α-Nb+TiFe)、TiFe、α-Nb、FeNb,置氢后合金硬度降低原因是氢原子的引入促进位错增殖以及促使双扭折形核造成内部缺陷。
Nb-Ti-Fe hydrogen filtration alloy membrane has been widely paid attention because of its high hydrogen permeability and low price.However,up to now,there are few reports on the corrosion resistance of the alloy film,and the relationship between the microstructure and corrosion resistance of the alloy has not been established.Based on this,the microstructure,corrosion resistance and microhardness of Nb-Ti-Fe hydrogen separation alloy before and after hydrogen treatment were studied in this work.The results show that:in the two groups of Nb_(10)Ti_(50+x)Fe_(40-x)and Nb_(15)Ti_(45+x)Fe_(40-x)(x=0,5,10,15)alloys,the microstructure of the alloy is composed of primaryα-Nb phase and eutectic(α-Nb+TiFe)phase when x<10,while the primary phase is phase TiFe when x>10.When x=10,a small amount of primaryα-Nb phase exists in Nb_(10)Ti_(60)Fe_(30),but this phase disappears in Nb_(15)Ti_(55)Fe_(30)alloy and is replaced by eutectic(α-Nb+TiFe)phase.Secondly,an extremely thin oxide covering layer is formed on the surface of the alloy after electrochemical corrosion,which is divided into Nb_(2)O_(5),TiO_(2),Nb_(2)C and Fe_(2)O_(3).The corrosion performance is closely related to the type and composition of the phase.The corrosion resistance of Nb_(10)Ti_(65)Fe_(2)5 alloy(4#)is strong.The Nb_(15)Ti_(45)Fe_(40)alloy(5#)with more FeNb has the lowest corrosion resistance.In addition,the hydrogen-loading properties of the alloys are gradually improved with the increase of Ti/Fe atomic ratio.On the other hand,the Vickers hardness values decrease first and then increase.The average hardness values of the alloys are distributed between 520HV—570HV.The microhardness values of each phase in the structure are eutectic(α-Nb+TiFe),TiFe,α-Nb,FeNb from small to large.The reason for the decrease in hardness of the alloy after hydrogen implantation is that the introduction of hydrogen atoms promotes dislocation proliferation and promotes double kink nucleation,resulting in internal defects.
作者
黄仁君
闫二虎
陈运灿
葛晓宇
程健
王豪
刘威
褚海亮
邹勇进
徐芬
孙立贤
HUANG Renjun;YAN Erhu;CHEN Yuncan;GE Xiaoyu;CHENG Jian;WANG Hao;LIU Wei;CHU Hailiang;ZOU Yongjin;XU Fen;SUN Lixian(Guangxi Key Laboratory of Information Laboratory,Guilin University of Electronic Technology,Guilin 541004,Guangxi,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2023年第7期171-177,共7页
Materials Reports
基金
国家自然科学基金(52161034)
国家重点研发计划(2018YFB1502103)
广西自然科学基金(2019JJA160006)
桂林电子科技大学研究生教育创新计划(2021YCXS155,2019YCXS109)
广西八桂学者基金、中德国际合作项目(GZ1528)
广西信息材料重点实验室基金(211012-Z)。
