Zr-Mn-V-Ni储氢电极合金中的Zr-Ni相形成及其晶体结构研究

Occurrence and Crystal Structure of Zr-Ni Phases in the Zr-Mn-V-Ni Laves Phase Hydrogen Storage Electrode Alloys

Ｚｒ（Ｍｎ０．４５－ｘＮｉ０．５５Ｖｘ）２（ｘ＝０．０５～０．４０）Ｌａｖｅｓ相储氢合金中的Ｚｒ－Ｎｉ相类型主要有ＺｒＮｉ和Ｚｒ９Ｎｉ１１相。ＺｒＮｉ１１相在整个研究的成分范围内出现，而 ＺｒＮｉ相仅在ｘ＝０．２０－０．４０范围内出现。Ｚｒ９Ｎｉ１１相的含量与合金中的 Ｍｎ、Ｖ含量关系不大，而ＺｒＮｉ相的含量随合金中的Ｍｎ、Ｖ含量变化呈增加趋势。Ｚｒ９Ｎｉ１１和ＺｒＮｉ相的晶格常数随合金中的Ｍｎ、Ｖ含量变化而出现波动。Ｚｒ９Ｎｉ１１相为长程有序结构，有序堆垛方向为［１００］和［０１０］，同时ＺｒＮｉ１１相基本上被包围在Ｃ１５相中间，并与Ｃ１５相存在一定取向关系，Ｚｒ９Ｎｉ１１相的＜１１１＞晶向与Ｃ１５相的＜１１０＞晶向基本平行，两者的差值在２°～３°之间。

The types of Zr-Ni phases occurring in the Laves phase hydrogen storage alloys Zr(Mn0.45-xNi0.55Vx)2 (x=0.05-0.40) are ZrNi and Zr9Ni11 phases. The Zr9Ni11 phase may occur in the whole composition range, and the Zr-Ni phase only appears in the ranges of 0.2 to 0.4. The content of Zr9Ni11 phase shows little variation with the concentrations of Mn and V, however, the content of ZrNi phase shows a tendency to increase with increasing V content. The lattice parameters of ZrNi and Zr9Ni11 phases also change with the contents of Mn or V in the alloys .The Zr9Ni11 phase has a long-range order structure with an ordered stack orientation of [100] and [010]. The (111) orientation is almost parallel (at an angle of 20°-30°) to the (111) orientation of C15 phase.