Approximants C4 and C5 of the Decagonal Quasicrystal in Al70Co15Ni10Tb5 Alloy Obtained by Quenching from Melting State under High Static Pressure
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摘要: 使用静高压熔态淬火方法，在Al70Co15Ni10Tb5合金中截获到两个新的十次准晶相关相C4和C5。其晶胞参数分别为：底心正交晶体（C4），=1.38 nm，b=1.60 nm，c=2.0 nm；简单正交晶体（C5），=1.20 nm，b=1.60 nm，c=2.30 mn。对二者的高分辨象进行了分析和研究，发现他们有着密切的关系，且可以认为是Penros拼图有序化的结果。
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关键词:
- 准晶相关相 /
- AlCoNiTb合金 /
- 静高压 /
- 熔态淬火
Abstract: Two new approximants of the decagonal quasicrystal were found in the Al70Co15Ni10Tb5 alloy, which was prepared by quenching from melting state under high static pressure (7.0 GPa). The lattice parameters of the approximants were =1.38 nm, b=1.6 nm, c=2.0 nm (C4, B-type orthorhombic crystalline phase); =1.20 nm, b=1.60 nm, c= 2.30 nm (C5, P-type orthorhombic crystalline phase), respectively. They were also studied by means of high-resolution electron microscopy (HREM). It was found that there was a close relationship between them. The HREM pattern can be regarded as an ordered one of Penrose tiling. -
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