均匀化处理对2195铝锂合金显微组织及再结晶行为的影响  

Influence of homogenization treatment on microstructure and recrystallization behavior of 2195 Al−Li alloy

作　　者：付绒 黄元春[1,2,3] 刘宇 李辉 王志文[3] Rong FU;Yuan-chun HUANG;Yu LIU;Hui LI;Zhi-wen WANG(School of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China;State Key Laboratory of High Performance and Complex Manufacturing,Central South University,Changsha 410083,China;Research Institute of Light Alloy,Central South University,Changsha 410083,China)

机构地区：[1]中南大学机电工程学院,长沙410083 [2]中南大学高性能复杂制造国家重点实验室,长沙410083 [3]中南大学轻合金研究院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第8期2255-2271,共17页中国有色金属学报（英文版）

基　　金：the financial support from the National Natural Science Foundation of China(No.U1837207).

摘　　要：采用扫描电镜、X射线衍射、透射电镜及电子背散射衍射等方法研究均匀化处理过程中2195合金的显微组织演变和Al3Zr析出相对再结晶行为的影响。结果表明,经均匀化处理后,铸态合金中严重的枝晶偏析得到有效消除,但其过程受到溶解速度较慢的Al−Cu相的限制。此外,与其他均匀化处理工艺(单级、双级和以60℃/h斜坡升温的均匀化处理)相比,在以30℃/h斜坡升温的均匀化处理条件下,样品(H30)中析出尺寸较细小且密度较大的Al3Zr弥散相。Al3Zr弥散相的尺寸越小,密度越高,其具有的Zener钉扎阻力越强,可阻碍位错及(亚)晶界的移动。因此,在热压缩及后续固溶处理过程中H30样品表现出较强的再结晶抗力。该研究能为铸态2195铝合金热处理工艺参数的优化提供理论指导。The microstructural evolution during homogenization treatment and the recrystallization behavior caused by Al3Zr precipitate in 2195 alloy were investigated via scanning electron microscopy,X-ray diffraction,transmission electron microscopy and electron backscatter diffraction.The severe dendrite segregation in the as-cast alloy was removed during homogenization,but the process was limited by the slower dissolution of Al−Cu phases.Moreover,the Al3Zr dispersoids precipitated in the sample homogenized by ramp heating rate of 30℃/h(H30)were finer and denser compared to the samples subjected to other homogenization treatments(single-step,double-step,and ramp heating rate of 60℃/h).The movement of dislocations and(sub)grain boundaries was resisted by the stronger Zener drag of finer and denser Al3Zr dispersoids.Thus,a higher recrystallization resistance during the hot compression and subsequent solution treatment was achieved for H30 sample.This work can provide theoretical guidance for optimizing the heat treatment parameters of the as-cast 2195 Al alloy.

关 键 词：Al−Cu−Li合金 均匀化 Al−Cu相溶解 Al3Zr析出相 再结晶 

分 类 号：TG146.21[一般工业技术—材料科学与工程]