Abstract
Vapour deposition of two Al-Ru alloys containing 10 and 15wt% Ru resulted in the formation of supersaturated solid solutions. Electron microscopy and electron diffraction techniques have been used to characterize this as-quenched structure and also those formed on subsequent decomposition. Elevated-temperature (650–800 K) annealing treatments resulted in the formation of a metastable intermediate phase. Electron diffraction evidence suggested that this phase can be assigned a simple cubic structure either of the Mo3N2-type witha=0.42 nm or of the Mg2Zn11-type witha=0.84 nm. Further annealing led to the formation of the equilibrium AI and AI6 Ru phases. The morphology and structural features of transformation products and the crystal structure details of the metastable intermediate phase have been discussed.
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