Brittleness of quasicrystal dispersed Al-Li-Cu alloy.

CORROSION BEHAVIOUR OF Al-Li-Cu-Mg ALLOY 8090-T651

New type of Al-based decagonal quasicrystal in Al60Cr20Fe10Si10 alloy.

A new kind of decagonal quasicrystal (DQC) with a periodicity of 1.23 nm was observed in the as-cast quaternary Al60Cr20Fe10Si10 alloy. The intensity distribution of some spots in the selected-area electron diffraction pattern along the tenfold zone axis was found to be different from other Al-based DQCs. High-angle annular dark-field scanning transmission electron microscopy was adopted to rev...

Ternary Model of an Al-Cu-Co Decagonal Quasicrystal

We propose a structural model for decagonal Al-Cu-Co quasicrystals based upon existing experimental diffraction data supplemented by total energy calculations. The model is a decoration of tiles related to the Penrose rhombus tiling. Strong chemical ordering between Cu and Co leads to chains of alternating Cu and Co atoms. These chains project onto tile edges, where they define arrows. At low t...

THE ICOSAHEDRAL Al-Li-Cu PHASE

STRUCTURE OF STABLE INTERMETALLIC COMPOUNDS OF THE Al-Li-Cu-(Mg) AND Al-Li-Zn-(Cu) SYSTEMS

The results of a thorough structural study of crystalline intermetallic compounds within the Al-Li-(Cu,Mg,Zn) system are given. Characteristic morphologies of these ternary or quaternary phases are exhibited by concentrated alloys or large single crystals. Typical X-ray powder diffraction data, selected area electron diffraction patterns and high resolution electron microscopy images are shown,...