The Relationship Between the Supercooled Liquid Region Elemental Enthalpy of Hydride Formation and Hydrogen Embrittlement in Amorphous Metallic Thin The relationship between the supercooled liquid region, elemental enthalpy of hydride formation, and hydrogen embrittlement in amorphous metallic thin Hydrogen is purified from a variety of feedstocks and is used in fuel cells, in the production of commodity chemicals, and for energy generation through the integrated gasification combined cycle , . Within the spectrum of membranes available for hydrogen separations (polymeric, inorganic, and metallic), amorphous metallic thin films have been considered as lower cost, stable alternatives to palladium membranes. Metallic membranes, which operate by a hydrogen dissociation-solution-diffusion mechanism, are capable of producing extremely high purity hydrogen. However, a critical problem facing all metallic membranes, both crystalline and amorphous, for hydrogen separations is hydrogen embrittlement of the metallic materials; which causes a rapid degradation in hydrogen selectivity performance. Amorphous metals (also called metallic glasses) have no long-range crystalline atomic order, are in a thermodynamically metastable state, and exhibit a glass transition temperature and associated supercooled liquid region (SCLR). The PI has experimentally demonstrated that elastic properties of metallic glasses are significantly different above and below the glass transition temperature, where they behave as viscoelastic liquids and solids respectively: this reflects changes in both atomic structure and enthalpic state of the glass/liquid. While existing amorphous metallic systems have been investigated for hydrogen purification performance, the relationship between material performance and properties has not been systematically evaluated with respect to the enthalpic state of the amorphous metals. In this research we will evaluate the hypothesis that hydrogen embrittlement in amorphous metallic membranes is closely tied to the viscoelastic properties of the alloy within the SCLR.
|Effective start/end date||9/1/12 → 8/31/15|
- ACS: Petroleum Research Fund: $100,000.00
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