Effect of structure transformations on the microhardness of Al-15at.% Zn alloy

The ageing of single crystals of Al-15 at. % Zn alloy was studied at the temperature of 205 °C by X-ray diffraction and by measurement of microhardness. A close correlation of individual structure stages with microhardness was found on ageing the alloy.In conclusion the authors would like to express their thanks to Doc. Dr. V. Syneek CSc. for helpful discussion, to Ing. J. Laek CSc. for the careful chemical analyses of the investigated alloy and to Mr. Z. iký and Mr. S. Pazour for assistance in measurements.