尊龙d88客户端下载Chinafirstestablishedinnanoporousmetalhydrogencapturequantitiveforecagmodel

2020-02-29 08:26:43作者:admin来源:未知

  China first established in nanoporous metal hydrogen capture quantitative forecasting model Reporters from the Chinese Academy of Sciences, Hefei Institute of Solid State Physics Institute was informed that the Task Force Wuxue Bang LIU Chang-song collaboration with McGill University Song Jun, the first time the quantitative prediction models body-centered cubic metals nanopore capture and aggregation of hydrogen blistering, hydrogen for understanding induced damage, and design of new material provides resistance to hydrogen-induced injury in a reliable theoretical basis and tools.The results of recently published in the journal "Nature Materials".Hydrogen is highly drilling inside of the metal material, leading to damage to the material.For example, the magnetic confinement fusion reactor core parts, the fuel can easily penetrate into the hydrogen isotope other components of the protective armor of tungsten, with the neutron irradiation to produce nanopore combined to form hydrogen bubbles and cracks, ultimately material structure and service performance fatal injury, endangering the safety of fusion devices.In order to overcome the above problems, researchers used a simulation method based on density functional theory, on the atomic scale precision obtained with nanopore hydrogen interaction data, combined with multi-scale simulations, simulation macro scale, thereby performing experiments with contrast verification.For hydrogen adsorbed on the inner wall is not smooth nanopore problems, they bcc tungsten as an example, by analyzing the trajectories of hydrogen, hydrogen is always found in the form of a single atomic number in order to adsorb specific position, a hydrogen complex adsorption of the inner wall of the hole can be summarized into five adsorption sites and the corresponding five adsorption level, thereby accurately describe the adsorption characteristics of the hydrogen is not smooth inner wall nanovoids.Based on the above rules, the researchers established a universal quantitative model: hydrogen depends on the type of energy on the inner wall and the surface density of the adsorption sites of hydrogen on the inner wall and the core portion of the hydrogen by the hydrogen energy density determined.Obtained predicted by the model and the hydrogen trapping structure can, highly consistent with the simulation results.The study established a quantitative model of the physical interaction of hydrogen and nano-pores, providing the long-sought understanding of hydrogen induced metal material is the key to cognitive damage.These metallic materials will not only be used in future fusion reactor first wall armor, the power to achieve controlled nuclear fusion, will play a crucial role in hydrogen cars and aerospace and other fields.

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