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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Cyclic hydrogenation of an LmNi_5-based alloy with different hydrogen loadings
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Cyclic hydrogenation of an LmNi_5-based alloy with different hydrogen loadings

机译：具有不同氢负荷的LmNi_5基合金的循环加氢

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摘要

Cyclic hydrogenation of an LmNi_5-based alloy up to 3000 cycles at room temperature was conducted. Based on the (P-C-T) curve of the activated alloy, the initial charging pressures were set at four different values so that the saturated hydrogen loadings in equilibrium were controlled at H/M= 1.0, 0.75, 0.50, and 0.25. The cyclic hydrogenation test was made for each loading. The absorption kinetic curves, hydrogen contents, and (P-C-T) curves after 1000, 2000, and 3000 cycles of testing were collected and compared with those of the activated sample. It is observed that the maximum hydrogenation capacities are reduced to 0.95, 0.92, 0.82, and 0.74 for the loadings of 0.25, 0.50, 0.75, and 1.0, respectively. The plateaus for the loadings of 0.25 and 0.50 do not change much, but are lowered and become more sloped for the loadings of 0.75 and 1.0, indicating that non-homogeneous chemical modification has been induced. The X-ray diffraction patterns show broadening of the peaks for all samples, and even the presence of some second phase for the loading of 1.0. The degradation is explained based on reduction of grain size, phase separation, and accumulation of strain energy in the alloy.
机译：在室温下对LmNi-5基合金进行了多达3000个循环的循环氢化。根据活化合金的（P-C-T）曲线，将初始装料压力设置为四个不同的值，以使平衡状态下的饱和氢负荷控制在H / M = 1.0、0.75、0.50和0.25。对每个负载进行循环氢化测试。收集了1000、2000和3000个测试循环后的吸收动力学曲线，氢含量和（P-C-T）曲线，并与活化样品的曲线进行了比较。可以看出，对于0.25、0.50、0.75和1.0的负载，最大氢化能力分别降低到0.95、0.92、0.82和0.74。加载量为0.25和0.50的平稳期变化不大，但降低了，并且对于加载量为0.75和1.0的平稳期更加倾斜，这表明已诱导了非均相化学修饰。 X射线衍射图显示所有样品的峰均变宽，甚至在1.0的装载量下也存在一些第二相。退化的解释是基于晶粒尺寸的减小，相分离以及合金中应变能的积累。

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