1. Anisotropic Strain Enhanced Hydrogen Solubility in bcc Metals: The Independence on the Sign of Strain.
- Author
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Hong-Bo Zhou, Shuo Jin, Ying Zhang, Guang-Hong Lu, and Feng Liu
- Subjects
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ANISOTROPY , *STRAINS & stresses (Mechanics) , *SOLUBILITY , *BODY-centered cubic metals , *LATTICE field theory , *BUBBLES - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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