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Hydrogen grain-boundary diffusion in nano-crystalline Mg-films - experimental and theoretical study

Hydrogen grain-boundary diffusion in nano-crystalline Mg-films - experimental and theoretical study
纳米晶镁薄膜中的氢晶界扩散——实验和理论研究
批准号:
213953861
负责人:
Professorin Dr. Astrid Pundt
金额:
$0.0万
依托单位国家:
德国
项目类别:
Research Grants
财政年份:
2012
资助国家:
德国
项目状态:
已结题
起止时间:
2011-12-31 至 2018-12-31

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中文摘要
翻译
氢的晶界扩散与替代元素的晶界扩散有很大的不同:替代元素的晶界扩散比体扩散快三个数量级,而间隙氢的晶界扩散慢于或类似于氢的体扩散。Mütschele和Kirchheim在1986年为低氢浓度的纳米晶钯证明了这一点。此外,在假设GBS不会转变为氢化物相而保持其类非晶态性质的情况下,可以很容易地解释纳米晶Pd-H的不同等温线。在这个项目中,我们计划强调这样一个观点,即Gb主要在整个浓度范围内保持其性质,从而导致在高浓度下Gb的扩散应该与在低浓度下测量的结果相似。这对于转变成体积扩散系数低的超稳定氢化物的合金特别有意义,因为GB可以作为氢扩散的途径。微观结构和应力状态可以优化,以获得最快的扩散率。镁转变为稳定的镁-二氢化物相,具有极低的体扩散系数。此外,由于其高的重量存储密度,MG对移动存储应用特别感兴趣。通过所提出的研究,我们希望将GBs作为氢扩散途径这一概念的基础研究与设计纳米晶、更快动力学的储氢材料的新方面联系起来。
英文摘要
Grain boundary (GB) diffusion of hydrogen differs strongly from that of substitutional elements: while GB diffusion of substitutional elements is about three orders of magnitude faster than bulk diffusion, GB diffusion of interstitial hydrogen is slower or similar to hydrogen bulk diffusion. This was proven by Mütschele and Kirchheim in 1986 for nano-crystalline Pd for low hydrogen concentrations. Moreover, different isotherms of nano-crystalline Pd-H can be easily explained under the assumption that GBs do not transform into a hydride phase but keep their amorphous-like properties. In this project we plan to stress the idea that GBs mainly keep their properties over the full concentration range leading to the result that GB diffusion at high concentrations should be similar to that measured at low concentrations. This is of special interest for alloys transforming into extra-stable hydrides with low bulk diffusivity, because GBs could act as pathways for hydrogen diffusion. Microstructure and the stress state could be optimized for fastest diffusivity. Mg transfers into a stable Mg-dihydride phase with extremely low bulk diffusivity. Mg is, further, of special interest for mobile storage applications because of its high gravimetric storage density. With the proposed studies we hope to link basic research on the idea of GBs acting as pathways for hydrogen diffusion with promising new aspects for the design of nano-crystalline, faster kinetics hydrogen storage materials.
期刊论文(4)
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会议论文
DOI: 10.1016/j.actamat.2014.11.031
发表时间: 2015-02
期刊: Acta Materialia
影响因子: 9.4
作者: [H. Uchida;S. Wagner;M. Hamm;J. Kürschner;R. Kirchheim;B. Hjörvarsson;A. Pundt]
通讯作者: H. Uchida;S. Wagner;M. Hamm;J. Kürschner;R. Kirchheim;B. Hjörvarsson;A. Pundt
DOI: 10.1016/j.ijhydene.2019.10.057
发表时间: 2019-12-06
期刊: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
影响因子: 7.2
作者: [Hamm, Magnus, Bongers, Marian David, Pundt, Astrid]
通讯作者: Pundt, Astrid
DOI: 10.1016/j.ijhydene.2017.05.050
发表时间: 2017-08
期刊: International Journal of Hydrogen Energy
影响因子: 7.2
作者: [M. Hamm;A. Pundt]
通讯作者: M. Hamm;A. Pundt
DOI: 10.1016/j.ijhydene.2017.11.101
发表时间: 2018-01
期刊: International Journal of Hydrogen Energy
影响因子: 7.2
作者: [N. Teichmann;M. Hamm;A. Pundt]
通讯作者: N. Teichmann;M. Hamm;A. Pundt
Study of kinetics and thermodynamics in thin films at the limit between coherent and semi-coherent phasetransformation
kinetics and thermodynamics of nano-scale systems
Percolation of palladium microstructures by hydrogen-induced lattice expansion - experimental and theoretical studies
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  • 批准号:
    19923843
  • 项目类别:
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  • 资助金额:
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  • 财政年份:
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  • 负责人:
    Professorin Dr. Astrid Pundt
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