Al-Zn-Cu系室温低Cu侧的相平衡关系  

Relationship Between Different Phase Equilibria of Al-Zn-Cu Alloys in Low-Copper Part at Room Temperature

作　　者：陈辉[1] 信昕[1] 董丹阳[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）》2004年第5期416-419,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：通过显微组织观察和X射线衍射分析,结合电子探针分析,确定了在Al Zn Cu系中所设计的14个不同成分的合金经充分成分均匀化和平衡阶梯冷却至20℃的合金相组成及成分·在其中11个合金中发现了T′相(Al4Cu3Zn)的存在,测定了4个合金中的T′相的成分,并得到了新的相平衡关系·从另一个侧面证实了T′相在室温时(20℃)是可以稳定存在的,同时说明美国金属学会1997年出版的相图集中的Al Zn Cu系20℃等温截面相图在低Cu侧的相关系上是不正确的·The phase composition and relevant constituents of 14 different alloys designed for Al-Zn-Cu system were analyzed by means of microscopy, XRD and EPMA, which were all fully homogenized and evenly cooled step to step to 20 ℃. Among them the T′ phase (Al_4Cu_3Zn) were found in 11 alloys, then the composition of T′ phases in 4 alloys were defermined with the relationship between new phase equilibria also found. The results prove in another way that the T′ phase may exist stably at room temperature, i.e., 20 ℃. In addition to the conclusion, it also indicates that the relationship between the phase equilibria low-copper part on the isothermal section diagrams at 20 ℃ of Al-Zn-Cu alloys, which were shown in the collection of phase diagrams as published by ASM in 1997, is improper.

关 键 词：Al-Zn-Cu三元系 T′相 相平衡 相图 等温截面 EPMA 

分 类 号：TG113.12[金属学及工艺—物理冶金]