热处理及晶粒组织对2A55超高强铝锂合金板材各向异性的影响  

Effect of Heat Treatments and Grain Structures on the Anisotropy of Super High-strength 2A55 Al-Li Alloy Sheets

作　　者：邹智涛 李劲风[1] 马鹏程 陈永来[2] 张绪虎[2] ZOU Zhitao;LI Jinfeng;MA Pengcheng;CHEN Yonglai;ZHANG Xuhu(School of Material Science and Engineering,Central South University,Changsha 410083;Aerospace Research Institute of Materials&Processing Technology,Beijing 100076)

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]航天材料及工艺研究所,北京100076

出　　处：《宇航材料工艺》2024年第3期45-54,共10页Aerospace Materials & Technology

摘　　要：采用室温拉伸力学性能测试、X射线织构检测、EBSD分析等方法,对比研究了10 mm与2 mm厚度2A55超高强铝锂合金板材的平面各向异性,阐释热处理制度与晶粒组织对板材各向异性的影响。结果表明,热处理后板材屈服强度最高的取向为轧向(0°)与横向(90°);Taylor因子能较好地预测固溶态与T6态时效板材屈服强度的各向异性,织构是平面各向异性的重要原因;厚板更高含量的织构与长条状的晶粒形貌导致其各向异性强于薄板;时效热处理使10 mm厚度板材各向异性减弱,使2 mm厚度薄板各向异性增强;T3态、T8态板材的各向异性分别强于T4态、T6态,时效前的预变形增强了板材的平面各向异性。In this paper,the in-plane anisotropy of super high-strength 2A55 Al-Li alloy sheets with thicknesses of 10 mm and 2 mm were compared and analyzed by means of tensile test at room temperature,X-ray and EBSD texture detection,etc.The effects of different heat treatments and grain structures were studied.The results show that the hard orientations were parallel to the rolling direction(0°)and the transverse direction(90°)after heat treatments.The anisotropic behavior of the sheets can be mainly attributed to the crystallographic texture,because the calculated Taylor factors were consistent with the yield strength anisotropy of the solutionized sheets and the sheets in condition T6.The severer anisotropy of 10 mm-thickness sheets was attributed to higher volume fraction of textures and aspect ratio of grains.Moreover,the aging treatments weakened the anisotropy of 10 mm-thickness sheets,but it had an opposite effect on 2 mm-thickness sheets.Sheets in condition T3 and T8 displayed severer inplane anisotropy than those in condition T4 and T6.The pre-deformation before aging treatments increased the anisotropic behavior of the sheets.

关 键 词：铝锂合金 热处理 织构 泰勒因子 各向异性 

分 类 号：TG146.2[一般工业技术—材料科学与工程]