锻压技术

2A97铝锂合金三层空心结构件超塑成形/扩散连接工艺

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

作者：刘文俊1 罗斌1 武永1 2

单位：1.南京航空航天大学机电学院 2. 南京航空航天大学航空航天结构力学与控制全国重点实验室

分类号：TG302

出版年,卷(期):页码：2023,48(8):78-82

摘要：

开展了2A97铝锂合金三层空心结构件的超塑成形/扩散连接工艺仿真和实验研究，以获得合理的工艺参数。通过高温拉伸实验测得2A97铝锂合金在变形温度为460 ℃、应变速率为0.001 s-1条件下的伸长率为183.4%，表现出良好的高温塑性。采用ABAQUS有限元软件分析了芯板夹角和气压加载路径对三层空心结构件成形质量的影响，得出合理的芯板夹角为45°、合理的应变速率为0.001 s-1，在此条件下，零件的最大减薄位于筋条与面板过渡区域，最大减薄率为59.4%。在变形温度为460 ℃、整形压力为2 MPa条件下，成功制备了2A97铝锂合金三层空心结构件，芯板的最大减薄率约为46.7%，扩散接头剪切强度为125.5 MPa，固溶时效后剪切强度升高至142.6 MPa。

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.

基金项目：

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

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