Analysis of W/Mo alloying on hydrogen permeation performance of dual phase Nb-Ti-Ni alloys based on hydrogen chemical potentials
| Autor: | Ruirun Chen, Kunjun Zhu, Zhifei Zhu, Yanqing Su, Dongmei Liu, Markus Rettenmayr, Xinzhong Li, Jingjie Guo |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Hydrogen chemistry.chemical_element Filtration and Separation Biochemistry Lower temperature Membrane chemistry Permeability (electromagnetism) Mechanical stability Physical chemistry General Materials Science Physical and Theoretical Chemistry Solubility Hydrogen permeation Hydrogen embrittlement |
| Zdroj: | Journal of Membrane Science. 584:290-299 |
| ISSN: | 0376-7388 |
| DOI: | 10.1016/j.memsci.2019.05.004 |
| Popis: | Substitution of Nb by the subgroup VI elements W and Mo was performed for dual phase Nb-Ti-Ni alloys containing a large fraction of primary bcc-(Nb) phase, particularly Nb45Ti27.5Ni27.5 and Nb56Ti23Ni21. The alloying effect on the hydrogen permeation performance as a function of the W/Mo concentration was analyzed based on a description considering the chemical potential of hydrogen. The substitution of Nb by W or Mo leads to a reduced hydrogen solubility, which contributes to enhanced resistance to hydrogen embrittlement. Effect of W/Mo alloying on the mobility of H atom and thus the hydrogen permeability is dependent on the W/Mo concentration and the operative temperature. Simultaneous improved hydrogen mobility and mechanical stability of the membrane, especially at lower temperature T ≤ 523 K, was achieved after W/Mo alloying by 5 at%. Specifically, Nb40W5Ti27.5Ni27.5 and Nb46W5Mo5Ti23Ni21 membranes exhibit robust properties during hydrogen permeation cycle between 423 and 673 K. |
| Databáze: | OpenAIRE |
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