Abstract
The structure transformations during the ageing at 90 ‡C of Al-30 wt. % Zn alloys prepared from Al of 99.7, 99.99 and 99.999 wt. % were studied by X-ray diffraction and by transmission electron microscopy. Simultaneously, the measurement of Vicker's microhardness was carried out. It was found that Fe and Si impurities affect substantially the structure transformations and the microhardness values during the ageing process. These impurities retard the formation of lamellar aggregates ofΒ-phase and of impoverishedα-matrix and thus they slow down the softening of the alloy.
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In conclusion we would like to express our thanks to Doc. Dr. V.Syneček CSc. for his valuable discussions. We are also indebted to Mr. V.Petr and Mr. Z.šikýŘ for their help in the microhardness and X-ray diffraction measurements, and to Mr. P.Vyhlídka for the homogeneity check of the investigated samples.
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Bartuška, P., Simerská, M. & šíma, V. Effect of iron and silicon on structure transformations and on microhardness of Al-30 wt. % Zn alloy aged at 90 °C. Czech J Phys 25, 1139–1148 (1975). https://doi.org/10.1007/BF01798695
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DOI: https://doi.org/10.1007/BF01798695