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arXiv 1504.02720cond-mat.mtrl-sci
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锆中的氢与空位团簇

Hydrogen and vacancy clustering in zirconium

Céline Varvenne, Olivier Mackain, Laurent Proville, Emmanuel Clouet

摘要:

用从头算方法研究了六方密排锆中溶质氢对空位团稳定性的影响,包括H振动的贡献。密度泛函理论中的原子模拟证明了H与小空位团簇的强结合。氢对大空位环的影响通过其与堆垛层错的相互作用来模拟。的热力学模型的H偏析的各种故障,依赖于从头计算结合能,表明这些故障是丰富的H,导致堆垛层错能的减少。这与实验观察到的空位环对H的捕获是一致的。更强的捕获,从而更强的稳定,是获得的空位环躺在基面,即负责在高辐照剂量下观察到的脱离生长的环。

英文摘要:

The effect of solute hydrogen on the stability of vacancy clusters in hexagonal closed packed zirconium is investigated with an ab initio approach, including contributions of H vibrations. Atomistic simulations within the density functional theory evidence a strong binding of H to small vacancy clusters. The hydrogen effect on large vacancy loops is modeled through its interaction with the stacking faults. A thermodynamic modeling of H segregation on the various faults, relying on ab initio binding energies, shows that these faults are enriched in H, leading to a decrease of the stacking fault energies. This is consistent with the trapping of H by vacancy loops observed experimentally. The stronger trapping, and thus the stronger stabilization, is obtained for vacancy loops lying in the basal planes, i.e. the loops responsible for the breakaway growth observed under high irradiation dose.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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