Electron microscope study of the symmetry of the basic atom cluster and a structural change of decagonal quasicrystals of Al-Cu-Co alloys
Electron microscope study of the symmetry of the basic atom cluster and a structural change of decagonal quasicrystals of Al-Cu-Co alloys
复制标题
Al-Cu-Co合金基本原子簇对称性及十方准晶结构变化的电镜研究
DOI：
10.1080/01418619608244389
复制
发表时间：
1996
影响因子：
1.6
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
用高分辨电子显微术和会聚束电子衍射研究了退火Al_（65）Cu_（15）Co_（20）合金十次准晶的基本原子团簇对称性和空间群。结果表明，团簇沿c轴（十边轴）的投影沿着为五边形，空间群为P105/mmc。熔融淬火的Al-Cu-Co合金的十角准晶（其属于P10 m2空间群）先前被发现具有五角簇（Saitoh等人，1994，Mater. Sci. Engng A，181-182，805）。因此，无论样品制备方法如何，Al-Cu-Co准晶中原子团簇沿c轴沿着投影的对称性都是五边形的。快淬Al-Cu-Co合金的空间群在600°C左右由P10 m2变为P105/mmc。在P10 m2相，反转畴的大小为几十纳米，并且在一个畴中的所有团簇具有相同的极性。因此，要么...
Abstract The symmetry of the basic atom cluster and the space group of the decagonal quasicrystal of an annealed Al65Cu15Co20, alloy have been investigated by high-resolution electron microscopy and convergent-beam electron diffraction. It has been revealed that the symmetry of the clusters projected along the c-axis (decagonal axis) is pentagonal and that the space group is P105/mmc. Decagonal quasicrystals of melt-quenched Al-Cu-Co alloys, which belong to the space group of P 10 m2, were previously found to have pentagonal clusters (Saitoh et al. 1994, Mater. Sci. Engng A, 181–182, 805). Therefore, the symmetry of the atom clusters projected along the c-axis is pentagonal in the Al-Cu-Co quasicrystals irrespective of specimen preparation methods. The space group of melt-quenched Al-Cu-Co alloys changes from P 10 m2 to P105/mmc at about 600°C. In the P 10 m2 phase, the inversion domains are several tens of nanometres in size and all the clusters in one domain have the same sense of polarity. Thus, either...