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Anisotropic strain enhanced hydrogen solubility in bcc metals: the independence on the sign of strain

Zhou, Hong-Bo ; Jin, Shuo ; Zhang, Ying ; Lu, Guang-Hong ; Liu, Feng

Physical review letters, 28 September 2012, Vol.109(13), pp.135502 [Tạp chí có phản biện]

E-ISSN: 1079-7114 ; PMID: 23030102 Version:1

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  • Nhan đề:
    Anisotropic strain enhanced hydrogen solubility in bcc metals: the independence on the sign of strain
  • Tác giả: Zhou, Hong-Bo ; Jin, Shuo ; Zhang, Ying ; Lu, Guang-Hong ; Liu, Feng
  • Chủ đề: Physics
  • Là 1 phần của: Physical review letters, 28 September 2012, Vol.109(13), pp.135502
  • Mô tả: When an impurity is doped in a solid, it inevitably induces a local stress, tending to expand or contract the lattice. Consequently, strain can be applied to change the solubility of impurity in a solid. Generally, the solubility responds to strain "monotonically," increasing (decreasing) with the tensile (compressive) strain if the impurity induces a compressive stress or vice versa. Using first-principles calculations, however, we discovered that the H solubility can be enhanced by anisotropic strain in some bcc metals, almost independent of the sign of strain. This anomalous behavior is found to be caused by a continuous change of H location induced by anisotropic strain. Our finding suggests a cascading effect of H bubble formation in bcc metals: the H solution leads to H bubble formation that induces anisotropic strain that in turn enhances H solubility to further facilitate bubble growth.
  • Ngôn ngữ: English
  • Số nhận dạng: E-ISSN: 1079-7114 ; PMID: 23030102 Version:1

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