2050铝合金厚板的晶间腐蚀行为研究  

Research on Intergranular Corrosion Behavior of 2050 Aluminum Alloy Thick Plate

作　　者：贺添一 邓运来 张劲[1,2] HE Tianyi;DENG Yunlai;ZHANG Jin(Light Alloy Research Institute,Central South University,Changsha 410083,China;State Key Laboratory of High Performance and Complex Manufacturing,Central South University,Changsha 410083,China)

机构地区：[1]中南大学轻合金研究院,湖南长沙410083 [2]中南大学高性能与复杂制造国家重点实验室,湖南长沙410083

出　　处：《热加工工艺》2021年第8期33-37,共5页Hot Working Technology

基　　金：国家重点研发计划重点专项项目(2017YFB0306301)。

摘　　要：90 mm厚的2050铝合金热轧厚板的微观组织在厚度方向上的不均匀性导致其厚度方向的晶间腐蚀性能存在差异。采用电子背散射衍射(EBSD)技术对不同层的晶粒特征进行表征;采用透射电镜(TEM)观察试样的形貌。对试样的晶间腐蚀进行分析。通过EBSD技术揭示了不同层的晶间腐蚀性能与其微观组织状态之间的联系。结果表明:从表层到中心层,合金的晶粒尺寸逐渐增大。试样不同层的亚晶界存在T1(Al2CuLi)相富集现象。从表层到中心层,合金晶间腐蚀性能下降。The inhomogeneity of the microstructure of 90 mm-thick 2050 aluminum alloy thick plate in the thickness direction leads to the difference of intergranular corrosion performance in thickness direction.The electron backscatter diffraction(EBSD)technology was used to characterize the grain characteristics of different layers.The transmission electron microscopy(TEM)was used to observe the morphology.The intergranular corrosion of the samples was analyzed.The relationship between the intergranular corrosion performance and the microstructure of different layers was revealed by EBSD technology.The results show that from the surface layer to the center layer,the grain size of the alloy gradually increases.The T1(Al2CuLi)phase enrichment phenomenon appears in the sub-grain boundaries of samples in different layers.The intergranular corrosion performance of the alloy decreases from the surface layer to the central layer.

关 键 词：2050铝合金 晶间腐蚀 微观组织 T1相 

分 类 号：TG146.21[一般工业技术—材料科学与工程]