Convergent-beam electron diffraction and electron microscope study on decagonal quasicrystals of AlCuCo and AlCo alloys
Convergent-beam electron diffraction and electron microscope study on decagonal quasicrystals of AlCuCo and AlCo alloys
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AlCuCo和AlCo合金十方准晶的会聚束电子衍射和电镜研究
DOI：
10.1016/0921-5093(94)90744-7
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发表时间：
1994
期刊：
影响因子：
6.4
通讯作者：
T. Masumoto
中科院分区：
文献类型：
--
作者：
K. Saitoh;K. Tsuda;Michiyoshi Tanaka;A. Tsai;A. Inoue;T. Masumoto
通过会聚束电子衍射（CBED）和透射电子显微镜研究了熔融淬火AlCuCo和AlCo合金的十方准晶。 CBED方法表明合金的空间群是非中心对称的P 10 m2。 Al 73 Co 27 是第一个非中心对称二元准晶。暗视野显微镜揭示了反相域的存在，在域边界处具有 c/2 的反相移。这些结果与熔融淬火合金 Al 70 Ni 15 Fe 15 的结果类似（Saito 等人，Jpn. J. Appl. Phys.，31 (1992) L109）。然而，在AlNiFe系中观察到的作为过渡金属成分函数的结构相变在本体系中并未发生，并且在高分辨率电子显微镜图像中观察到两种类型的五边形原子簇图像，但在AlNiFe合金中仅观察到一种类型。
Decagonal quasicrystals of melt-quenched Al Cu Co and Al Co alloys have been investigated by convergent-beam electron diffraction (CBED) and transmission electron microscopy. The CBED method has revealed that the space group of the alloys is non-centrosymmetric P 10 m2. Al 73 Co 27 is the first non-centrosymmetric binary quasicrystal. Dark-field microscopy has revealed the existence of inversion domains with an antiphase shift of c/2 at the domain boundaries. These results are analogous to those for the melt-quenched alloy Al 70 Ni 15 Fe 15 (Saito et al., Jpn. J. Appl. Phys., 31 (1992) L109). However, structural phase transformation as a function of the transition metal composition, as observed for the Al Ni Fe system, does not occur in the present system, and two types of pentagonal atom cluster images are observed in high-resolution electron microscope images, but only one type in the Al Ni Fe alloys.