摘要:
The 800 °C isothermal section in the Al-Zn-Zr system was investigated using the equilibrated alloy method and the solid/liquid diffusion couple approach by means of scanning electron microscopy equipped with energy dispersive spectroscopy,X-ray powder diffraction and electron probe microanalysis.Thirteen three-phase regions are experimentally confirmed in the ternary system.A ternary compound Zn50Al25Zr25 named as T phase exists stably in the 800 °C isothermal section.Its composition range varies widely (16.84-55.1 at.% Zn,18.02-56.3 at.% Al and 26.0-28.53 at.% Zr),and it can be in equilibrium with all the binary compounds.The maximum solubilities of Zn in Zr3Al,Zr2Al,Zr3Al2,Zr4Al3,ZrAl,Zr2Al3,ZrAl2 and ZrAl3 are 7.5,0.84,0.33,0.89,0.91,1.12,0.64 and 3.8 at.%,respectively.The maximum solubilities of Al in Zn3Zr,Zn2Zr and ZnZr are 1.6,1.3 and 13.6 at.%,respectively.%利用扩散偶和平衡合金法,采用扫描电镜一能谱、X射线衍射和电子探针分析方法对Al-Zn-Zr三元系800°C等温截面进行实验测定.实验确定了13个三相区;三元化合物Zn5oAl25Zr25(T相)稳定存在于此等温截面,拥有比较大的成分区间(16.84%~55.1% Zn、18.02%~56.3% Al和26.0%~28.53% Zr,摩尔分数),并能与该体系中所有的二元化合物平衡共存.Zn在Zr-Al化合物Zr3Al、Zr2Al、Zr3Al2、Zr4Al3、ZrAl、Zr2Al3、ZrAl2和ZrAl3中最大溶解度分别是7.5%、0.84%、0.33%、0.89%、0.91%、1.12%、0.64%和3.8%(摩尔分数);Al在Zn-Zr化合物Zn3Zr、Zn2Zr和ZnZr中最大溶解度分别是1.6%、1.3%和13.6%(摩尔分数).