合金化对ZrMn_2基Laves相贮氢合金相组成的影响

Effect of alloying elements on phase composition of ZrMn_2-based Laves phase hydrogen storage alloys

研究了Ni、V、Cr、Co、Fe、Cu和Ti等合金化元素取代ZrMn2 基Laves相贮氢合金的B侧或A侧对合金相组成的影响。结果表明 ,采用不同的元素对A侧或B侧进行部分取代 ,将引起ZrMn2 基合金相组成的变化。采用Ni取代Mn后 ,ZrMn2 合金的主相结构转变为C15型Laves相 ,表明Ni为C15相稳定元素。对Zr Mn Ni三元合金 ,V为C14相稳定元素 ,而Co、Fe、Cu则为C15相稳定元素。取代量较少时 ,Cr为C15相稳定元素 ,取代量增加时 ,C15相稳定作用减弱。Ti元素为C14相稳定元素 ,Ti对Zr的部分取代将导致合金主相结构转变为C14型Laves相。合金化元素对ZrMn2

The effect of substitution of Ni, V, Cr, Co, Fe, Cu and Ti element in A or B side on the phase composition of ZrMn 2 based Laves phase hydrogen storage alloys were investigated systematically. The results show that the partial substitution in A or B side by various elements will lead to the change of phase composition. The stable major phase is of C15 type Laves phase with the partial substitution of Mn by Ni element, indicating that Ni is C15-stabilized elements. For Zr-Mn-Ni ternary alloy, V is C14-stabilized element, Co, Fe and Cu are C15-stabilized element, Cr is C15-stabilized element when the substitution amount is small. However, the effect of stabilization decreases with the content increasing. Ti is C14-stabilized element, the major phase of ZrMn 2 based Laves alloys will be transferred to C14 type Laves phase with the partial substituted of Zr by Ti element. The phase component has a correlation with the atomic radius and electronic concentration of the corresponding substitution element.