Abstract
X-ray diffraction, optical metallography, transmission electron microscopy, and hardness measurements were used to study the phase composition and microstructure of the quenched and aged Zr–Ru alloys containing from 0.25 to 5 at.% ruthenium. It was established that a two-phase microstructure, consisting of the α-phase and a β-phase enriched with ruthenium, is formed during quenching of the alloys containing up to 1 at.% ruthenium. A metastable ω-phase is formed in the alloys containing from 1.5 to 4 at.% ruthenium. Only a diffuse ω-phase is observed in the Zr–5 at.% Ru alloy after quenching. The metastable ω-phase is formed in this alloy after aging at 400°C for 30 min. The ω-phase remains present in the Zr–1.5 at.% Ru alloy after aging at 500°C for 3 h and in the Zr–5 at.% Ru alloy after aging at 500°C for 22 h.
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