Approximants in annealed IQC(Icosahedral Quasicrystal)-DQC(Decagonal Quasicrystal) pseudo-binary alloys

来源期刊：中国有色金属学报(英文版)2003年第6期

论文作者：雷奕 J. M. Dubois M. Calvo-Dahlborg 黑祖昆 P. Weisbecker 董闯

文章页码：1360 - 1366

Key words：quasicrystals; approximants; phase diagram; e/a-constant line

Abstract: The structure and microstructure of constituent phases in annealed IQC_100-xDQC_x alloys, made from mixtures of Al₆₂Cu_25.5Fe_12.5 icosahedral quasicrystal (IQC) and Al₇₀Co₁₅Ni₁₅ decagonal quasicrystal (DQC), were studied by X-ray diffractometry(XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDAX). These constituent phases are mostly approximants: λ, β and τ3. In addition, an Al-Cu-Co DQC phase is observed in IQC₈₀DQC₂₀ alloy. The nature of these approximants and their relationship with the quasicrystals(QCs) are discussed; and the evolution of these phases is interpreted by the shifting of their e/a-constant lines in the Al-(Cu, Ni)-(Fe, Co) pseudo-ternary phase diagrams.