摘要
采用电弧感应熔炼制备了Nb44Ti28Ni28-xFex(x=0,5,10,15,摩尔分数/%)合金,通过X射线衍射仪和扫描电镜(SEMQuanta 200FEG)对其显微组织进行研究。结果发现,x≤10时,Nb44Ti28Ni28-xFex合金组织由初生相和共晶体组成;x>10时,在亚共晶组织中将析出NbFe相。系统研究了Nb44Ti28Ni28-xFex(x=0,5,10)合金的氢溶解、氢渗透和氢扩散性能。结果发现,随Fe含量增加,氢溶解度略有降低,氢渗透性能则先增加后降低;温度在523~673K时,Nb44Ti28Ni23Fe5合金的氢渗透性能最佳,且673K时约为相同条件下Nb44Ti28Ni28合金的1.5倍,这主要得益于其氢本征扩散系数的大幅增加。
The Nb44Ti28Ni28-xFex(x=0,5,10,15)ingots were prepared by the non-consumable vacuum arc melting.The microstructure of the ingot was analyzed by the scanning electron microscope(SEM-Quanta 200FEG)and X-ray diffraction analysis.The results reveal that microstructure of Nb44Ti28Ni28-xFex alloys is composed of the primary phases and eutectics when x≤10,while the NbFe phases are precipitated in the subeutectic structure when x>10.The hydrogen solubility,hydrogen permeability and hydrogen diffusion of Nb44Ti28 Ni28-xFex(x=0,5,10)alloys were systematically investigated.The results indicate that the hydrogen solubility of alloys is slightly decreased with the increase of Fe content,while the permeability is increased at first and then decreased.The Nb44Ti28Ni23Fe5alloy exhibits the optimal hydrogen permeability at temperatures above 523K,and it is 1.5times higher than that of Nb44Ti28Ni28alloy at 673K,which mainly benefits from the substantially increase of intrinsic hydrogen diffusion coefficient.
作者
李新中
张乐
朱坤军
张锦研
Li Xinzhong;Zhang Le;Zhu Kunjun;Zhang Jinyan(School of Iron and Steel,Soochow University;School of Materials Science and Engineering,Harbin Institute of Technology)
出处
《特种铸造及有色合金》
CAS
北大核心
2020年第12期1309-1313,共5页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51771066)。
