DIFFERENTIAL SCANNING CALORIMETRY AND X-RAY DIFFRACTION STUDIES ON AGING BEHAVIOR OF Zn-Al ALLOYS
来源期刊:Acta Metallurgica Sinica2001年第2期
论文作者:Z.W.Yu X.L.Xu S.J.Ji Z.K.Hei J.C.Sun
Key words:differential scanning calorimetry (DSC); X-ray diffraction(XRD); aging; Zn-Al alloy;
Abstract: Decomposition processes of the quenched Zn-Al alloys were studied by differentiai 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 c' phase formed by quenching would reduce with increasing Zn content and precipitating η-Zn phases even when aging at ambient temperature,so that exothermic precipitation peak in DSC curve would disappear. The activation energy of the η-Zn 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.
Z.W.Yu1,X.L.Xu1,S.J.Ji1,Z.K.Hei1,J.C.Sun1
(1.Dalian Maritime University, Dalian 116024, China)
Abstract:Decomposition processes of the quenched Zn-Al alloys were studied by differentiai 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 c'' phase formed by quenching would reduce with increasing Zn content and precipitating η-Zn phases even when aging at ambient temperature,so that exothermic precipitation peak in DSC curve would disappear. The activation energy of the η-Zn 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.
Key words:differential scanning calorimetry (DSC); X-ray diffraction(XRD); aging; Zn-Al alloy;
【全文内容正在添加中】