Transactions of Materials and Heat Treatment

Title：Superplastic forming and diffusion bonding process on 2A97 Al-Li alloy three-layer hollow structure part

Authors： Liu Wenjun1 Luo Bin1 Wu Yong1 2

Unit： 1. College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics 2. State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and Astronautics

KeyWords： 2A97 Al-Li alloy superplastic forming and diffusion bonding three-layer hollow structure part core plate angle air pressure loading path

ClassificationCode：TG302

year,vol(issue):pagenumber：2023,48(8):78-82

Abstract：

The simulation and experiment research of superplastic forming and diffusion bonding process for 2A97 Al-Li alloy three-layer hollow structure part were carried out to obtain the reasonable process parameters. Then, the elongation of 2A97 Al-Li alloy is 183.4% under the conditions of the deformation temperature of 460 ℃ and the strain rate of 0.001 s-1 measured by high-temperature tensile experiment which shows good high-temperature plasticity. Furthermore, the influences of core plate angles and air pressure loading paths on the forming quality of three-layer hollow structure part were studied by finite element software ABAQUS, and it is concluded that the reasonable core plate angle is 45° and the reasonable strain rate is 0.001 s-1. Under this condition, the maximum thinning rate of part is 59.4%, located in the rib-to-panel transition region. Finally, under the conditions of the deformation temperature of 460 ℃ and the shaping pressure of 2 MPa, a three-layer hollow structure part of 2A97 Al-Li alloy is successfully prepared, the maximum thinning rate of core plate is about 46.7%, the shear strength of diffusion bonded joint is 125.5 MPa which increases to 142.6 MPa after solution aging.

Funds：

国家自然科学基金资助项目（51805256）；中央高校基本科研项目（56XAC21017）；国家博士后基金资助项目（2020M670792）

作者简介：刘文俊（2002-），男，本科生,E-mail：liuwenjun@nuaa.edu.cn;通信作者：武永（1986-），男，工学博士，副教授,E-mail：wuyong@nuaa.edu.cn

Reference：

[1]刘莹莹, 李洁洁, 杨健, 等.孔挤压强化对2A97铝锂合金耳片疲劳性能的影响[J].稀有金属,2022,46(9):1254-1260.

Liu Y Y, Li J J, Yang J, et al. Hole expansion strengthening on fatigue properties of 2A97 Al-Li alloy lugs[J]. Chinese Journal of Rare Metals， 2022,46(9):1254-1260.

[2]章润喆, 马云龙, 刘丹阳, 等. 2195铝锂合金力学性能和组织与冷热变形过程的相关性[J].稀有金属,2021,45(2):129-136.

Zhang R Z,Ma Y L,Liu D Y, et al. Dependence of mechanical properties and microstructures of 2195 Al-Li alloy on cold and hot deformation[J]. Chinese Journal of Rare Metals，2021,45(2):129-136.

[3]Chen R, Wang H M, He B, et al. Effect of thermal cycling on microstructure and mechanical properties of 2A97 Al-Li alloy fabricated by direct laser deposition [J]. Vacuum, 2021, 190: 110299.

[4]Zou G T, Ye L Y, Li J, et al. Microstructure evolution and deformation mechanisms of a banded-grained 2A97 Al-Cu-Li alloy during superplastic deformation[J]. Materials Science and Engineering： A,2023，876:145178.

[5]王燕,杜荣.2A97-T84铝锂合金型材形变热处理工艺技术研究 [J].铝加工,2021, 263(6):49-52.

Wang Y, Du R. Research on deformation heat treatment technology of 2A97-T84 Al-Li alloy [J]. Aluminium Fabrication, 2021, 263(6):49-52.

[6]Ning J, Zhang L J, Bai Q L, et al. Comparison of the microstructure and mechanical performance of 2A97 Al-Li alloy joints between autogenous and non-autogenous laser welding [J]. Materials & Design, 2017,120:144-156.

[7]Novotny S, Geiger M. Process design for hydroforming of lightweight metal sheets at elevated temperatures[J]. Journal of Materials Processing Technology,2003,138(1-3):594-599.

[8]张新明, 谢磊, 叶凌英, 等.时效制度对2A97铝锂合金晶粒细化和超塑性的影响[J].金属热处理,2014,39(2):88-93.

Zhang X M,Xie L,Ye L Y, et al. Effect of aging treatment on grain refinement and superplasticity of 2A97 aluminum-lithium alloy[J]. Heat Treatment of Metals, 2014,39(2):88-93.

[9]Jia L，Ren X P，Zhang Y L，et al. Forming-limits analysis of the superplastic 2A97 Al-Li alloy [J]. Materials and Tehnologies, 2020, 54(3)：397-405.

[10]Zhao Z C, Xu J H, Fu Y C, et al. An investigation on adaptively machining the leading and tailing edges of an SPF/DB titanium hollow blade using free-form deformation [J]. Chinese Journal of Aeronautics, 2018, 31(1): 178-186.

[11]Li Y M, Wang H L, Niu T, et al. Study on SPF/DB technology for two-sheet hollow structure of 1420 Al-Li alloy [J]. Metals, 2022, 12(3): 389.

[12]Du Z H,Wang C X, Liu Q, et al. The superplastic forming/diffusion bonding of TA7 titanium alloy for manufacturing hollow structure with stiffeners [J] Journal of Manufacturing Processes, 2022, 73(1): 385-394.

[13]李晓华, 韩秀全, 王飞,等. 钛合金两层整体构件超塑成形/焊接组合工艺与质量控制 [J]. 航空制造技术, 2013, (16): 28-31.

Li X H,Han X Q,Wang F, et al. Superplastic forming/welding combination technology and quality control of titanium alloy two-layer integrated component [J]. Aeronautical Manufacturing Technology, 2013, (16): 28-31.

[14]王会东, 付和国, 韩颖杰, 等. 大型双曲率非等厚TC4钛合金壁板整体SPF/DB成形工艺及优化 [J]. 锻压技术, 2022, 47(1): 75-80.

Wang H D,Fu H G,Han Y J, et al. Integral SPF /DB forming process and its optimization for TC4 titanium alloy panel with large size， dual curvature and non-uniform thickness[J]. Forging & Stamping Technology, 2022, 47(1): 75-80.

[15]Hefti L D. Fine-grain Ti-6AI-4V for superplastic forming and diffusion bonding of aerospace products [J]. JOM, 2010, 62(5): 42-45.

[16]张凌云, 祁桂根. 铝锂合金在航空业的应用及SPF/DB工艺进展 [J]. 金属成形工艺, 2001, 19(3): 1-3.

Zhang L Y,Qi G G. Application of Al-Li alloys in aeronautical industry and advances on SPF／DB [J].Metal Forming Technology, 2001, 19(3): 1-3.

[17]陈国庆, 尹乾兴, 司晓庆, 等. 铝锂合金焊接技术的研究现状分析 [J]. 焊接学报, 2019, 40(8): 155-160，168.

Chen G Q,Yin Q X,Si X Q, et al. Research status analysis of aluminum-lithium alloy welding [J]. Transactions of The China Welding Institution, 2019, 40(8): 155-160，168.

[18]高云鹏, 王颖, 王东坡, 等. TC11钛合金扩散连接接头组织及力学性能研究 [J]. 稀有金属材料与工程, 2023, 52(2): 770-776.

Gao Y P，Wang Y,Wang D P, et al. Microstructure and mechanical properties of diffusion bonded TC11 alloy joint [J]. Rare Metal Materials and Engineering, 2023, 52(2): 770-776.

[19]杜立华, 张兴振, 韩晓宁, 等.几何参数对SPF/DB三层结构表面质量的影响研究[J].航空制造技术,2018,61(10):100-103.

Du L H，Zhang X Z，Han X N，et al. Influence of geometric parameters on surface quality of SPF/DB hollow structure[J]. Aeronautical Manufacturing Technology,2018,61(10):100-103.

Service：

【This site has not yet opened Download Service】【Add Favorite】