Abstract
The results of experiments on the icosahedral to crystalline transformation of melt-spun Al51Cu12.5Li16.5Mg20 are reported. The microstructural characteristics of the alloy, in all stages of the transformation, have been determined using a combination of transmission electron microscopy, X-ray diffraction and differential scanning calorimetry. The as-spun alloy consists of icosahedral grains with a low volume fraction of quenched-in crystallites. The quasilattice constant is calculated to be 0.505 nm. Upon annealing at 394 °C for 20 min, the icosahedral phase completely transforms to Al5Cu(Li, Mg)3 (a b c c phase), aluminium and a hexagonal phase. The orientation relationships and chemical compositions of all phases involved are established. Electron microscopy reveals planar defects in all the crystalline phases (except aluminium). The planar defects in the b c c phase are on {1 1 0} and {1 0 0}-type planes. Defects in the hexagonal phase are found to be on {0001} and {11 ¯20}-type planes.
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