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arXiv 2008.05768cond-mat.mtrl-sci
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Pd和CoPd薄膜吸氢的晶格响应动力学

Kinetics of the lattice response to hydrogen absorption in thin Pd and CoPd films

S. S. Das, G. Kopnov, A. Gerber

摘要:

氢可以可逆地渗透许多金属,占据间隙位置并引起晶格的大膨胀。这里讨论的问题是结构响应的动力学是否与氢吸收相匹配。我们表明,薄Pd和CoPd膜暴露于相对丰富的氢气氛(4%H2)不可逆地膨胀,表现出可控的形状记忆,并且该过程的持续时间可以比氢吸收长几个数量级。非平衡塑性蠕变的动力学很好地描述了Avrami型模型的形核和横向畴壁膨胀的溶胀网站。

英文摘要:

Hydrogen can penetrate reversibly a number of metals, occupy the interstitial sites and cause large expansion of the crystal lattice. The question discussed here is whether the kinetics of the structural response matches hydrogen absorption. We show that thin Pd and CoPd films exposed to a relatively rich hydrogen atmosphere (4% H2) inflate irreversibly, demonstrate the controllable shape memory, and duration of the process can be orders of magnitude longer than hydrogen absorption. The dynamics of the out-of-equilibrium plastic creep is well described by the Avrami - type model of the nucleation and lateral domain wall expansion of the swelled sites.

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