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An Electrical Resistivity Study on Hydrogen Absorption and Structural Change in Glassy Alloys

玻态合金吸氢和结构变化的电阻率研究

基本信息

批准号：
60550510
负责人：
TANAKA Kazuhide
金额：
$ 1.22万
依托单位：
NAGOYA INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550510/
关键词：
Amorphous alloys Hydrogen absorption Electrical resistivity Crystallization X-ray diffraction Spectroscopy Bonding states

项目摘要

Titanium and zirconium-based alloy glasses absord a large quantity of hydrogen and show P-C-T characteristics varying considerably according to the species and compositions of the alloying elements. The objective of the present research is to study the absorption-desorption behavior of hydrogen in Zr-Ni and Zr-Pd alloy glasses by electrical resistivity measurements as well as to clarify the crystallizing process in the hydrogenated glasses. A computer-controlled apparatus for the resistivity measuredments has been constructed. This enables us to hydrogenate a ribbon sample in a gas phase of 5MPa between 300K and 500K, and measure the resistivity in situ between 10K and 1000K. Resistivity changes during hydriding at 423K and 493K and subsequent dehydriding at higher temperatures have been measured for Zr_<67>Ni_<33> and Zr_<50>Ni_<50> alloy glasses. Both samples showed characteristic variations of the resistivity against the hydrogen content. Upon heating above 500K, Zr_<67>Ni_<33>H_x decomposed into ZrH_2 and Zr-Ni compounds, whereas Zr_<50>Ni_<50>H_x crystallized to ZrNi compound by releasing hydrogen prior to the crystallization. This behavior was confirmed by X-ray diffraction analysis.In addition to the above work, soft X-ray and photoemission studies have been carried out for Ti and Zr-based glassy alloys containing Fe, Ni and Pd. The results showed that hydrogen atoms preferentially combine with Zr or Ti atoms in these glasses to form chemical bonding. This effect is important to characterize the thermal stability of hydrogen in the metallic glasses.

钛基和锆基合金玻璃吸氢量大，其P-C-T特性随合金元素的种类和组成而变化。本研究的目的是通过电阻率测量研究氢在Zr-Ni和Zr-Pd合金玻璃中的吸放氢行为，并阐明氢化玻璃的晶化过程。研制了一套微机控制的电阻率测量装置。这使我们能够在300 - 500 K之间将带状样品置于5 MPa的气相中，并在10 - 1000 K之间原位测量电阻率。本文测量了Zr_ Ni_2和Zr_ Ni_2合金玻璃在423 K和493 K退火及随后高温放氢过程中的电阻率变化<67><33><50><50>。两种样品都显示出电阻率随氢含量的特征变化。在500 K以上加热时，Zr_<67>Ni_<33>H_x分解为ZrH_2和Zr-Ni化合物，而Zr_<50>Ni_<50>H_x在晶化前通过释放氢而晶化为ZrNi化合物。除了上述工作外，还对含Fe、Ni和Pd的Ti和Zr基非晶合金进行了软X射线和光电子能谱研究。结果表明，在这些玻璃中，氢原子优先与Zr或Ti原子联合收割机形成化学键。这种效应对于表征氢在非晶合金中的热稳定性具有重要意义。