首页|Hydrogen and nitrogen absorption properties of Ce-added Zr2(Fe1-xNix)alloys
Hydrogen and nitrogen absorption properties of Ce-added Zr2(Fe1-xNix)alloys
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To improve the nitriding resistance of Zr2Fe alloy,the Ce-added Zr2(Fe1-xNix)(x=0,0.15,0.3,0.5)alloys were prepared by magnetic levitation melting method.The effects of Ni substitution for Fe on the phase structure,hydrogen and nitrogen absorption properties of the alloys were investigated by X-ray diffraction,scanning electron microscopy and p-c isotherm measurements.The experimental results show that Ni substitution can effectively inhibit the formation of both α-Zr and ZrFe2 phases and pro-mote the formation of C16 structure Zr2(Fe,Ni)phase,causing Ni-substituted alloys to exhibit low ni-trogen absorption rate and capacity.At 623 K under 0.5 MPa nitrogen pressure,the nitrogen absorption capacity of Ce-added Zr2(Fe0.5Ni0.5)alloy reaches to 0.8 mL/g,much lower than that of Zr2Fe alloy(1.5 mL/g).Ni substitution decreases the crystal cell volume of the C16 Zr2(Fe,Ni)phase,resulting in an increase in the hydrogen absorption equilibrium pressure.At 623 K under 0.05 MPa hydrogen pressure,the hydrogen absorption capacity decreases from 1.46 wt％of Zr2Fe alloy to 1.41 wt％of Ce-added Zr2(Fe0.5Ni0.5)alloy.
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