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The phase decomposition of the  0 phase in the Zn-22 mass%Al and Zn-22 mass%Al-2 mass%Cu at room temperature was followed by means of the X-ray diffraction (XRD), transmission electron microscopy (TEM) and Vickers hardness (VH) measurements. Alloys were homogenized at 623 K for 432 ks and then quenched at 275 K. Immediately, they were characterized by XRD and simultaneously other samples were analyzed by hardness Vickers measurements. The XRD results showed that the  0 phase is unstable at room temperature and its decomposition finished after 1.8 and 18 ks by the following reaction,  0 !  þ  , for the Zn-22 mass%Al and Zn-22 mass%Al-2 mass%Cu alloys, respectively. The TEM analysis was carried out in the Zn-22 mass%Al-2 mass%Cu alloy, which showed a slower kinetics than the Zn22 mass%Al alloy. The TEM results showed in situ that the  0 phase is in coexistence with the " phase and its decomposition occurs by the

&beta;&prime; Phase Decomposition in Zn-22 mass%Al and Zn-22 mass%Al-2 mass%Cu Alloys at Room Temperature

β′ Phase Decomposition in Zn-22 mass%Al and Zn-22 mass%Al-2 mass%Cu Alloys at Room Temperature