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首页> 外文期刊>Philosophical Magazine Letters >Icosahedral-phase formation and stability in Ti-Zr-Co alloys
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Icosahedral-phase formation and stability in Ti-Zr-Co alloys

机译：Ti-Zr-Co合金的二十面体相形成和稳定性

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摘要

We present the first report of icosahedral phase i-phase formation in rapidly quenched alloys of Ti Zr Co . Electron diffraction patterns of i TiZrCo 53 27 20 contain features, such as anisotropic spot shapes and arcs of diffuse scattering, that are characteristic of the disordered icosahedral phases found in Ti 3d transition metal Si O and Ti Zr Fe alloys. The features are less prominent than in those alloys, however, suggesting that this i-phase may have structural order intermediate between those strongly disordered i-phases and more ordered Ti Zr Ni i-phases, showing none of these features. The quasilattice constant for a i TiZrCo , 0 51 nm, is close to that of i TiZrNi . The i-phase in rapidly q quenched Ti Zr Co alloys is deeply metastable and transforms exothermically o to the hexagonal Laves phase about 500 C. The Laves phase transforms to the o T bcc solid solution phase b-Ti and the Ti Ni-type fcc structure for 630 C. A 2 reversible transformation between the b-Ti and the hexagonal solid solution phase a-Ti is observed on temperature cycling; the Ti Ni-type fcc phase is 2 stable over the entire temperature range.
机译：我们提出了Ti Zr Co快速淬火合金中二十面体i相形成的第一份报告。 TiZrCo 53 27 20的电子衍射图包含各向异性斑点形状和扩散散射弧等特征，这些特征是Ti 3d过渡金属Si O和Ti Zr Fe合金中发现的无序二十面体相的特征。这些特征没有那些合金中的突出，但是，表明该i相可能在那些强烈无序的i相和更有序的Ti Zr Ni i i相之间具有结构序的中间点，没有显示这些特征。 i TiZrCo的准准常数为0 51 nm，接近i TiZrNi的准准常数。快速q淬火的Ti Zr Co合金中的i相是深亚稳的，在约500℃时放热地转变为六方Laves相。Laves相转变为o T bcc固溶体相b-Ti和Ti Ni型fcc在630℃的温度循环中观察到b-Ti和六方固溶体相a-Ti之间的2可逆转变。 Ti Ni型fcc相在整个温度范围内保持2稳定。

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