The temperature dependence of microstructure of the title alloys was studied in situ by XRD. Each alloy had been subjected to two different thermal treatments: (i) rapid quenching from the solid-solution temperature, TSS, in water at room temperature (RT) and ageing at RT (samples WQ) and (ii) cooling slowly from TSS to RT and ageing at RT (samples SC). As the samples SC were closer to the equilibrium state than the samples WQ, the microstructure of the two sets of samples dependeded on temperature in a different way. The solid solution, αSS, was formed at about 720 K for the samples SC, and at about 880 K for the samples WQ. During the slow cooling to RT the samples SC and WQ behaved in a similar way. Instead of the phase transitions expected according to the phase diagram, the following sequence of transitions was observed for both alloys: α(M/β)+β(Zn) – α0 +β(Zn)+α(M/α0 ,β) – αSS. A similar thermal behaviour was also found for the Zn-rich alloys, Al-54 at% Zn and Al-62 at% Zn.Primjenom rentgenske difrakcije in situ istraživali smo temperaturnu ovisnost mikrostrukture navedenih slitina. Slitine su bile prethodno podvrgnute različitim termičkim obradama: (i) brzom kaljenju s temperature čvrste otopine, TSS, u vodi pri sobnoj temperaturi (uzorci WQ); (ii) sporom hlađenju od TSS do sobne temperature i starenju pri sobnoj temperaturi (uzorci SC). Budući da su nakon starenja uzorci SC bili bliži ravnotežnom stanju nego uzorci WQ, mikrostruktura dviju skupina uzoraka ovisila je o temperaturi na različit način. Uzorci SC bili su prevedeni u stanje čvrste otopine, αSS, na temperaturi oko 720 K, a uzorci WQ na oko 880 K. Umjesto faznih pretvorbi koje bi se očekivale prema faznom dijagramu, opazili smo ovaj niz pretvorbi za obje slitine: α(M/β)+β(Zn) – α0 +β(Zn)+α(M/α0 ,β) – αSS. Slično ponašanje nađeno je i za slitine bogatije cinkom, Al-54 at% Zn i Al-62 at% Zn
