ICME指导高强Al-Cu-Li合金设计  

ICME guided design of high-strength Al-Cu-Li alloys

作　　者：杨兴海 王俊升 薛程鹏 王硕 苏辉 张宇轩 李星星 苗以升 YANG Xing-hai;WANG Jun-sheng;XUE Cheng-peng;WANG Shuo;SU Hui;ZHANG Yu-xuan;LI Xing-xing;MIAO Yi-sheng(School of Materials Science,Beijing Institute of Technology,Beijing 100081,China;Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学材料学院,北京100081 [2]北京理工大学前沿交叉科学研究院,北京100081

出　　处：《材料热处理学报》2023年第11期35-43,共9页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金面上项目(52073030);国家自然科学基金区域创新联合基金重点项目(U20A20276)。

摘　　要：从热力学计算入手,分析了Al-Cu-Li系合金中温度与各物相之间的联系。基于有限元方法,分别模拟了2050合金在半连续铸造中的温度场演变和冷速,以及具有轧制织构的T34态2050合金的应力应变关系,确定了2050合金的预变形区间为7%~9%。并将上述计算结果集成至应力时效态2050合金的实际制备过程。利用室温拉伸、透射电镜表征了应力时效后2050合金的力学性能和析出相演变。结果表明,2050合金在9%的预拉伸和200℃×7 h的应力时效条件下能获得较好的强塑性匹配,屈服强度达到600 MPa以上,伸长率大于8%。To design high-strength Al-Cu-Li alloys more efficiently,the relations between temperature and phases in Al-Cu-Li alloy were calculated based on thermodynamics.Based on the finite element method(FEM),the temperature field evolution and cooling rate of 2050 alloy in semi-continuous casting were simulated.The stress-strain relationship of T34-2050 alloy with rolling texture was also predicted by crystal plasticity FEM,and the pre-stretching level of the alloy before stress aging was determined to be 7%-9%.The above calculation results were integrated into the actual manufacturing process of stress-aged 2050 alloy.The mechanical properties and precipitation phase evolution of 2050 alloy after stress aging were characterized by room temperature stretching and transmission electron microscopy.The results show that a good strength-plastic matching of the 2050 alloy with 9%pre-strain can be achieved under the stress aging conditions of 200℃×7 h,with a yield strength of over 600 MPa and an elongation of more than 8%.

关 键 词：铝锂合金 相图计算 有限元 应力时效 集成计算材料工程 

分 类 号：TG146.2[一般工业技术—材料科学与工程]