Effect of pre-deformation on Creep age forming of AA2219 plate: Springback, microstructures and mechanical properties

被引:62
作者
Yang, Youliang [1 ,2 ,3 ]
Zhan, Lihua [1 ,2 ,3 ]
Ma, Qiangqiang [1 ,2 ,3 ]
Feng, Jingwen [1 ,2 ,3 ]
Li, Xianmeng [1 ,2 ,3 ]
机构
[1] Cent S Univ, State Key Lab High Performance Complex Mfg, Changsha 410083, Hunan, Peoples R China
[2] Cent S Univ, Sch Mech & Elect Engn, Changsha 410083, Hunan, Peoples R China
[3] Cent S Univ, Collaborat Innovat Ctr Adv Nonferrous Struct Mat, Changsha 410083, Hunan, Peoples R China
基金
中国国家自然科学基金;
关键词
2219 aluminum alloy; Creep age forming; Pre-deformation; Springback; Mechanical properties; Microstructures; 2124; ALUMINUM-ALLOY; AL-XCU ALLOYS; STRESS; STRENGTH;
D O I
10.1016/j.jmatprotec.2015.10.030
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Applying pre-deformation to high strength aluminum alloy between solution treatment and artificial aging is one of the effective ways to relieve quench-induced internal stress and achieve improved mechanical properties. This paper studies the effects of pre-deformation on springback, microstructures and mechanical properties of creep-age formed 2219 aluminum alloy plate. The results show that the introduction of pre-deformation can remarkably reduce the amount of springback, enabling the radius of deformed plate gets closer to the target value (1160 mm). The radius and springback of pre-stretched plate after creep age forming are 1370.1 mm and 15.3%; while for non-stretched plate, the values are 1635.6 mm and 29.1%, respectively. Furthermore, the mechanical performances of pre-deformation plate are better than those of non-deformation plate and more evenly distributed. As compared with non-stretched plate, the pre-stretched plate has higher tensile strength by 7.3%, higher yield strength by 20.8% and much lower in-plane anisotropy (IPA) of properties. These differences are attributed to the combined effects of heterogeneous nucleation and growth of precipitates at dislocations, discontinuous precipitates and narrower precipitation free zone (PFZ) along grain boundaries together with unobvious stress orientation effect in the pre-stretched plate. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:697 / 702
页数:6
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