氢在无序态和有序态Ni3Fe合金中的扩散行为  

Diffusion of Hydrogen in Disordered and Ordered Ni_3Fe Alloys

作　　者：陈业新[1] 马杰[1] 石丹丹[1] C．T．LIU 

机构地区：[1]上海大学材料研究所,上海200072 [2]田纳西大学材料科学与工程系,美国TN 37996-2200

出　　处：《上海大学学报（自然科学版）》2008年第5期456-460,466,共6页Journal of Shanghai University:Natural Science Edition

基　　金：国家自然科学基金资助项目(5037105050671057)

摘　　要：采用电解渗氢的方法研究室温下氢在无序态和有序态Ni3Fe合金中的扩散行为.研究结果表明,在相同渗氢温度下,渗氢后的Ni3Fe合金的延伸率随渗氢时间的增加而降低,拉伸断口上的沿晶断裂区(IG)的深度随渗氢时间的增加而增加;在相同渗氢时间下,合金拉伸断口上的沿晶断裂区的深度随渗氢温度的增加而增加.沿晶脆性断裂区的深度与渗氢温度和时间的关系符合菲克扩散方程的解.时间滞后法计算结果表明,氢在无序态Ni3Fe合金中的表观扩散系数高于在有序态合金中的表观扩散系数.氢在无序态和有序态Ni3Fe合金中的扩散激活能分别为44.9 kJ/mol和29.5 kJ/mol.studied by decreases Diffusion of hydrogen for disordered and ordered Ni3Fe alloys at room temperature has been cathodic charging with hydrogen. At the same temperature of precharging, the elongation and intergranular （IG） depth increases with increasing precharging time respectively for Ni3 Fe precharged precharging hydrogen. At the same time of precharging , the depth of IG increases with increase of temperature. Relationship between IG depth and temperature and time is in accordance with the solution of Fick law. Based on the time-lag method, the apparent diffusion coefficient of hydrogen in disordered Ni3Fe alloy is larger than that in ordered Ni3Fe alloy. The activation energy of hydrogen diffusion in disordered and ordered Ni3 Fe alloys is 44.9 kJ/mol and 29.5 kJ/mol respectively.

关 键 词：氢扩散 无序态 有序态 Ni3Fe合金 

分 类 号：TG111.6[金属学及工艺—物理冶金]