Determination of Optimum Composition for Hydrogen Absorption Alloys by Hydrogen Micro-Imaging System

本研究的目的是利用氢微成像系统确定吸氢合金的最佳成分，开发高性能吸氢合金。试样为BCC / Laves两相组织的V-Cr-Ti合金和Ti-Cr合金。通过改变合金的成分和热处理条件来控制合金的显微组织。采用氚放射光度法研究了其微观结构与氢分布的关系。氢的分布对局部成分和微观结构的差异很敏感。在氢渗透入合金的初始阶段，Laves相中的氢浓度较高。然而，随着合金中氢含量的增加，BCC相中的氢浓度增加。我开发了一种Ti-Cr吸氢合金，具有高达3.5质量%氢含量的高性能氢容量。

The purpose of the research is to determine the optimum composition of hydrogen absorption alloy using hydrogen micro-imaging system, and to develop high performance hydrogen absorption alloy.The specimens were V-Cr-Ti alloys and Ti-Cr alloys with BCC / Laves two-phase structure. The microstructures in these alloys were controlled by changing both the composition and heat treated condition of the alloys. The relation between the microstructure and hydrogen distribution was investigated by the tritium radioluminography. The hydrogen distribution is sensitive to the difference of the composition in local area and the microstructure. Hydrogen concentration in the Laves phase is higher at the initial stage of hydrogen penetration into the alloy. However, hydrogen concentration in the BCC phase increases as the enhancement of hydrogen content in the alloys. I have developed a Ti-Cr hydrogen absorption alloy with high performance hydrogen capacity up to 3.5 mass% hydrogen content.