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EFFECT OF COMPOSITION ON HYDROGEN EMBRITTLEMENT IN Ni-Fe FCC ALLOYS

HU Wei WANG Yanbin CHU WuYang XIAO Jimei University of Science and Technology Beijing , China Associate Professor , Department of Materials Physics , University of Science and Technology Beijing , Beijing 100083 , China

金属学报(英文版)

The ductility loss and threshold stress intensity,K_(IH)during hydrogen charging were measured for pure Ni and four Ni-Fe fcc alloys.The results show that ductility loss in 40Ni60Fe alloy and K_(IH)a 50Ni50Fe alloy have a minimum value.The variations of the amounts of hydride, hydrogen evolution and dislocation structure with composition have been investigated.The va- riation of hydrogen embrittlement susceptibility with composition measured by ductility loss and by K_(IH)or K_(IH)/K_C can be explained by means of the synthetical effects of amount of hydride,solutionized hydrogen and the extent of dislocation planarity on hydrogen embrittlement susceptibility.

关键词: Ni-Fe alloys , null

ChCl-urea-NiCl2-FeCl3离子液体电沉积Ni-Fe合金

介亚菲 , 华一新 , 徐存英 , 汝娟坚 , 齐灿灿 , 陈孔豪

材料科学与工程学报 doi:10.14136/j.cnki.issn 1673-2812.2016.02.009

以ChCl-urea-NiCl2-FeCl3离子液体为电解质在Fe基体上电沉积得到了Ni-Fe合金镀层.循环伏安测试表明电沉积过程中由于金属Ni的生成诱导金属Fe发生欠电位沉积,从而实现了Ni-Fe合金的共沉积.同时研究了电流密度对镀层成分、形貌和耐蚀性能的影响,结果表明:电流密度由2 mA/cm2增加到5 mA/cm2时,合金镀层中Fe含量从10.74 at％升高到39.21 at％.当Fe含量为24.89 at％时,镀层最为平整致密,耐蚀性能最好.此外,镀层的组成主要为FeNi3固溶体和Ni,还存在FeNi和Fe0.64 Ni0.36合金相.

关键词: Ni-Fe合金 , 离子液体 , 共沉积

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