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| 1 | Effect of Y_2O_3 content in the pack mixtures on microstructure and oxidation resistance of B–Y modified silicide coating显示文摘B–Y modified silicide coatings were prepared on Nb–Si based alloy by pack cementation at 1300 ℃ for 10 h. The effect of Y_2O_3 content in the pack mixtures on microstructure and oxidation resistance of the coatings was investigated. The results show that the four coatings have similar structures, which possess a(Nb,X)Si_2 outer layer and a(Nb,X)_5Si_3 transitional layer. Y_2O_3 content in the pack mixtures has an obvious effect on the Si content in the coating. The mass gains of the coatings prepared with 0.5, 1, 2 and 3 wt% Y_2O_3 in pack mixtures are 2.33, 1.96, 2.05 and 2.86 mg/cm^2 after oxidation at 1250 ℃ for 100 h, respectively. The coating prepared with 1 wt% Y_2O_3 exhibits the best oxidation resistance due to the formation of a dense glass-like borosilicate scale. | Yanxiang Liu Wan Wang Zongjie Liu Chungen Zhou | 2016 | Progress in Natural Science:Materials International2016，26，1： | 1 |
| 2 | Atomic-scale segregation behavior of Sn/Ti and O at Σ3[1ī0](111) grain boundary in niobium显示文摘First-principle calculation was performed to illustrate the atomic arrangement and segregation behavior of Sn/Ti and O in Σ3[1ī0](111) grain boundary, and the interaction of oxygen interstitials with Sn/Ti atoms on the grain boundary was studied. The analyses on the segregation energies and geometric positions, and the electron densities show that Sn, Ti and O atoms segregate at the Σ 3 grain boundary.And the preferred segregation sites of the impurities at Σ3[1ī0](111) were determined. When Sn segregates at grain boundary plane, the O atom prefers to the bulk-like site and shows no segregation tendency at grain boundary, whereas the segregated Ti atom can slightly enhance oxygen segregation at the grain boundary. | Zenghui Liu Jiaxiang Shang | 2016 | Progress in Natural Science:Materials International2016，26，2： | 0 |
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