The Formation of a New Approximant of Decagonal Quasi-Crystal in Al6FeYb Alloy under High Static Pressure
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摘要: 对掺稀土钇的铝铁合金（Al6FeYb）进行了静高压（4.8 GPa）熔态（1 400 ℃）淬火（冷却速率100 ℃/s）研究。使用透射电镜对样品中形成的微结构进行了观察。首次在该系统中发现了一个十次准晶相关晶体相。实验分析表明，该相为底心正交晶体相，电镜测得的晶胞参数为a＝0.716 nm，c＝2.195 nm。用已有的理论对该相的结构形成进行了讨论。Abstract: In the investigations, samples of Al6FeYb alloy were quenched with a cooling rate of 102 K/s from melting state (1 400 ℃) under high static pressure (4.8 GPa). A new crystalline approximant was observed and its structure was a B-type orthorhombic crystalline phase with the lattice parameters of a=0.716 nm, c=2.195 nm. The structure and formation of the crystalline approximant were discussed by the current theory.
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Key words:
- cystalline approximant /
- high-static pressure /
- quench from melting state /
- Al6FeYb
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