TiVNbTa难熔高熵合金的吸放氢动力学
Hydrogen absorption-desorption kinetics of TiVNbTa refractory high-entropy alloy
查看参考文献21篇
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文摘
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通过真空电磁感应悬浮熔炼技术制备TiVNbTa难熔高熵合金试样,采用多通道储氢性能测试仪测试合金的吸放氢性能,并研究该合金的吸(放)氢行为及其动力学机制。结果表明:单相BCC结构的TiVNbTa难熔高熵合金吸氢后生成TiH_(1.971),Nb_(0.696)V_(0.304)H和Nb_(0.498)V_(0.502)H_2 3种氢化物新相。氢化高熵合金粉末在519,593 K和640 K分别发生氢化物的分解反应,放氢后恢复单相BCC结构,因此TiVNbTa合金的吸氢反应属于可逆反应。该合金在423~723 K温度区间具有较高的吸(放)氢速率,其吸(放)氢动力学模型分别符合Johnson-Mehl-Avrami(JMA)方程和二级速率方程,吸(放)氢的表观活化能Ea分别为-21.87 J/mol和8.67 J/mol。 |
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其他语种文摘
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TiVNbTa refractory high-entropy alloy was prepared by vacuum electromagnetic levitation melting technology. The hydrogen absorption and desorption properties of the alloy were tested by multichannel hydrogen storage tester, the hydrogen absorption-desorption behavior and corresponding kinetic mechanisms were investigated. The results show that BCC single-phase structure in the alloy is transformed into three new phases including TiH_(1.971), Nb_(0.696)V_(0.304)H and Nb_(0.498)V_(0.502)H_2 after the hydrogen absorption process. The hydrides in the hydrogenated high-entropy alloy decompose at 519, 593 K and 640 K, respectively and change to BCC phase again after hydrogen desorption process. Therefore, the hydrogenation reaction is reversible. The alloy exhibits high hydrogenation (dehydrogenation) rates at 423- 723 K. The kinetics of hydrogen absorption and desorption can be described by Johnson-Mehl-Avrami (JMA) model and second-order rate model, respectively. The apparent activation energies Ea of hydrogen absorption and desorption are -21.87 J/mol and 8.67 J/mol, respectively. |
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来源
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材料工程
,2024,52(1):101-107 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2022.000592
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关键词
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难熔高熵合金
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吸放氢动力学
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表观活化能
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可逆反应
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地址
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1.
广东省金属新材料制备与成形重点实验室, 广东省金属新材料制备与成形重点实验室, 广州, 510640
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华南理工大学机械与汽车工程学院, 广州, 510640
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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广东省自然科学基金面上项目
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广州市基础研究计划基础与应用基础研究项目
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文献收藏号
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CSCD:7652194
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