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Decomposition processes of the quenched Zn-Al alloys were studied by differential scanning calorimetry (DSC), X-ray diffraction(XRD) and transmission electron microscopy (TEM). The results show that the stabilities of supersaturated solid solution (SSS) of Zn-Al alloy and α’ phase formed by quenching would reduce with increasing Zn content and precipitating ηZn phases even when aging at ambient temperature, so that exothermic precipitation peak in DSC curse would disappear. The activation enengy of the ηZn precipitation and their reaction enthalpy were calculated and measured. The kinetics of α’ decomposition or η-Zn formation was determined by XRD. The microstructure change during aging was observed by TEM.
Decomposition processes of the quenched Zn-Al alloys were studied by differential scanning calorimetry (DSC), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that the stabilities of supersaturated solid solution (SSS) of Zn- Al alloy and α ’phase formed by quenching would reduce with increasing Zn content and precipitating ηZ phases even when aging at ambient temperature, so that exothermic precipitation peak in DSC curse would disappear. The activation energy of the ηZn precipitation and their reaction enthalpy were calculated and measured. The kinetics of α ’decomposition or η-Zn formation was determined by XRD. The microstructure change during aging was observed by TEM.