STABLE DECAGONAL QUASICRYSTAL IN Al-Cu-Co ALLOYS

摘要

＜正＞ By applying electron diffraction,He et al.found the stable decagonal quasicrystal（T phase）in conventionally solidified Al65Cu20Co15alloy.According to X-ray diffraction pat-terns,Tsai et al.pointed out that only the Al65Cu15Co20alloy almost consisted of single Tphase and in the alloys different from this composition icosahedral phase would appear.Aphase diagram collected by Ageeva shows that there is an equilibrium χ-phase with γ-brassstructure about the above composition range.Thus,it is necessary to examine in detail the