为了考察Mo部分替代Ti对高容量V
40
Ti
50
Fe
10
合金储氢性能的影响
采用电弧熔炼制备了V
40
Ti
50-x
Mo
x
Fe
10
(x=0~30)合金
系统地研究了该系列合金的结构和储氢性能随Mo替代Ti含量的变化规律
并探讨合金储氢容量的衰退机制。研究表明:该系列合金均由主相体心立方(BCC)固溶体和少量的C14型Laves第2相组成;Mo取代Ti并未改变合金的主相结构
但Laves第2相的含量明显降低
合金整体均匀性增加;随着Mo含量的增加
BCC相的晶胞体积逐渐减小
合金的放氢量总体呈现下降趋势但中间出现波动状态
而放氢平台压则持续上升;在这一系列合金中
V
40
Ti
40
Mo
10
Fe
10
合金的储氢性能较优
具有相对宽泛且平坦的放氢压力平台
可逆储氢量较高
且室温下吸放氢过程均可在5 min内完成。循环测试表明
合金氢化物在吸放氢过程中会形成难以活化的TiFe相
导致合金出现成分分离
影响合金的稳定性
从而造成储氢容量衰退。
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