低Cu的Al-Zn合金在300℃时平衡相组成及稳定性  

Equilibrium phase constituents and stability in the Al-Zn alloy containing low Cu contents held at 300℃

作　　者：陈辉[1] 任玉平[2] 信昕[2] 董丹阳[2] 郝士明[2] 

机构地区：[1]沈阳建筑大学交通与机械学院,辽宁沈阳110168 [2]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《材料与冶金学报》2005年第2期167-170,共4页Journal of Materials and Metallurgy

基　　金：国家自然科学基金资助项目(50171019).

摘　　要：通过组织观察与X射线衍射分析,对熔制的Al20Zn5Cu合金(摩尔分数/%)铸锭在300℃保温不同时间后的试样组织结构进行了研究.结果发现铸锭中的ε相在300℃保温时完全转变成了细小的T′相,意味着此时的平衡相组成为α1,α2和T′相.而α1和α2相在冷却或室温放置时析出了β相,这意味着采用常规平衡合金法不适于测量α1,α2和T′相的平衡相成分.Microstructures of Al-20Zn-5Cu alloy (mole fraction /%) ingot held at 300℃ for different time has been studied by means of microstructural observation and X-ray diffraction analysis. It is found that the ε phase is completely transformed into the fine T′ phase in the alloy held at 300 ℃, which shows that the equilibrium phase constituents consist of α_1, α_2 and T′ phases. The β phase is precipitated from the α_1 or α_2 phase during the cooling processing or as the alloy being placed at room temperature, which means that it is disadvantageous to measure the equilibrium compositions of α_1, α_2 and T′ phases by using the conventional equilibrated alloy method.

关 键 词：Al-Zn-Cu系 相平衡成分 相变 

分 类 号：TG113.14[金属学及工艺—物理冶金]