Al-Zn-Cu三元系Al-Zn侧相平衡成分的测定  

Determination of Phase Equilibrium Composition on Al-Zn Side of Al-Zn-Cu Ternary System

作　　者：任玉平[1] 李洪晓[1] 刘宇翔[1] 郝士明[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2005年第6期562-565,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50171019)

摘　　要：采用扩散偶电子探针微区分析技术,对Al Zn Cu三元系相图的低Cu区三个固溶体相的相平衡关系及相平衡成分进行了研究·结果发现,在320℃时Cu的加入使得α1/α2,α2/β相平衡时的α1和α2中的Zn含量都降低·在260℃时,添加少量的Cu使得α/β平衡时α中的Zn含量增加·Cu在α1/α2,α2/β和α/β三种相平衡时的分配都不对称,即Cu在后者中的含量远大于前者·这意味着在320℃时Cu的加入使得α1/α1+α2相边界向富Al角趋近;在260℃时Cu的加入使得α/α+β相边界向Zn含量增加的方向偏移·The phase equibria and compositions of three solid solutions in the low Cu region of a Al-Zn-Cu ternary system were investigated by means of diffusion couple-EPMA technique. It was found that Zn contents in α_1 and α_2 both decrease due to Cu additions when α_1/α_2 and α_2/β are both in equilibrium at 320℃; Zn content in α increases with the small amount of Cu when α/β is in equilibrium at 260℃. The distribution ratios of Cu are all unsymmetrical when α_1/α_2, α_2/β and α/β are all in equilibrium, i.e., Cu content in the latter phase is much more than that in the former one. This means that the α_1/α_1+α_2 phase boundary approaches to Al-rich corner due to Cu additions at 320℃,and the α/α+β phase boundary is along the increasing direction of Zn content due to Cu additions at 260℃.

关 键 词：Al—Zn—Cu三元系 扩散偶法 电子探针 相平衡 溶解度间隙 

分 类 号：TG113.4[金属学及工艺—物理冶金]