Abstract
Investigations were carried out on seven alloys containing 10·5wt-%Al and up to 3wt-%Co. The effect of cobalt on the temperature of transformations in Cu–Al alloys as well as identification of phases existing in these alloys and identification of transformations occurring during aging of quenched alloys have been investigated. It was found that cobalt formed a new phase, CoAl(Cu), and increased the temperature of eutectoid transformation; in annealed alloys cobalt decreased the fraction of the eutectoid (α+γ2) and increased the fraction of the α-phase; in quenched specimens cobalt produced a fine grain structure within the β-phase and consequently fine-acicular martensite; in aged alloys martensite decomposed in two ways, resembling the continuous and discontinuous decomposition of supersaturated solution; cobalt inhibited decomposition of martensite and influenced the dispersion of that phase during aging of quenched alloys.
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