Effect of Ti substitution on the microstructure and properties of Zr-Mn-V-Ni AB(2) type hydride electrode alloys

The electrochemical capacity, hydrogen absorbed/desorbed activation propert ies of alloy Zr(Mn0.1V0.3Ni0.6)(2) were improved after Ti substitution for the Zr. The microstructure of Zr1-xTix(Mn0.1V0.3Ni0.6)(2) (x = 0, 0.5) allo ys was analyzed by x-ray diffraction (XRD), transmission electron microscop y (TEM), and energy dispersive spectrum (EDS) analysis. A systematic struct ural analysis shows that there are two phases in the Ti-substituted alloy o f Zr0.5Ti0.5(Mn0.1V0.3Ni0.6)2: C14 Laves phase and Ti-containing "premarten site" R phase of Ti0.8Zr0.2Ni The improvement of electrochemical properties of alloy Zr(Mn0.1V0.3Ni0.6)2 after Ti substitution can be attributed to th e Ti substitution for Zr sites in C14 Laves phase, the formation of Ti0.8Zr 0.2Ni R-phase, and disappearance of Zr-Ni binaries.