铝锂合金显微组织特征及其对力学性能的影响  

Microstructural Characteristics of Al-Li Alloys and Effect on Mechanical Properties

作　　者：孙达 钱沙沙 高崇 朱志雄 单梦蝶 蔡养川 SUN Da;QIAN Shasha;GAO Chong;ZHU Zhixiong;SHAN Mengdie;CAI Yangchuan(School of Materials Science and Engineering,Tianjin University of Technology,Tianjin 300384,China;Chinalco Materials Application Research Institute Co.,Ltd.,Beijing 102200,China;Aerospace Engineering Equipment(Suzhou)Co.,Ltd.,Suzhou 201100,Jiangsu,China)

机构地区：[1]天津理工大学材料科学与工程学院,天津300384 [2]中铝材料应用研究院有限公司,北京102200 [3]航天工程装备(苏州)有限公司,江苏苏州201100

出　　处：《焊管》2021年第10期13-18,23,共7页Welded Pipe and Tube

摘　　要：为了明确第三代铝锂合金的显微组织与力学性能之间的关系,利用光学显微镜和透射电子显微镜对三种新开发的铝锂合金(2A97-T8、2198-T8和2060-T8)的显微组织进行了定量评价,并用拉伸和硬度试验研究了其对力学性能的影响。结果表明,2060-T8、2A97-T8和2198-T8铝锂合金的显微组织是典型的轧制组织;铝锂合金的主要析出物为T1(Al2CuLi)、δ′(Al3Li)、S′(Al2CuMg)和θ′(Al2Cu),铝锂合金析出相体积分数的增加可显著提高其显微硬度和抗拉强度,铝锂合金中析出相的数量和种类可以显著影响面内各项异性;2A97-T8和2198-T8合金的断裂模式为韧脆混合断裂,而2060-T8合金为韧性断裂。In order to clarify the relationship between microstructure and mechanical properties of the third generation Al-Li alloy,quantitative evaluations of three recently developed Al-Li alloys(2A97-T8,2198-T8 and 2060-T8)microstructure were carried out by using OM(optical microscope)and TEM(transmission electron microscopy).The influences on mechanical properties were studied by using tensile and hardness testing machine.Results show that the microstructures of 2060-T8,2A97-T8 and 2198-T8 Al-Li alloy were typical rolling microstructures.The main precipitates of Al-Li alloys were T1(Al_(2)CuLi),δ′(Al_(3)Li),S′(Al_(2)CuMg)andθ′(Al_(2)Cu).The increased volume fraction of Al-Li alloys precipitates can significantly raise its micro-hardness and tensile strength.The IPA(in-plane anisotropy)can be significantly affected by the amounts and types of precipitates in Al-Li alloys.Fracture modes were ductile-brittle mixed fractures for 2A97-T8 and 2198-T8 alloys;while ductile fracture for 2060-T8 alloy.

关 键 词：铝锂合金 力学性能 析出物 显微组织 轧制 

分 类 号：TG146[一般工业技术—材料科学与工程]