锻压技术

2B06铝合金双层结构件DB&SPF组合工艺研究

英文标题：Research on DB&SPF combination process of double-layer structural parts for 2B06 aluminum alloy

作者：王国峰张建威张晓巍李骁王海伦

分类号：TG146.2

出版年,卷(期):页码：2020,45(7):187-191

摘要：

基于DB&SPF组合工艺的优势，采用表面碱洗预处理去除氧化膜的方法，实现了2B06铝合金双层结构件的制备。研究了表面粗糙度和扩散温度对2B06铝合金扩散连接接头组织和性能的影响，确定了最适宜的扩散连接工艺参数。通过高温单向拉伸实验、有限元仿真拟合等方法，制定了2B06铝合金超塑成形的工艺参数。结果表明：在连接压强为5 MPa、保温时长为2.5 h、扩散温度为500~530 ℃时，扩散连接效果较为理想；较低的表面粗糙度可以降低接头位置的氧含量浓度，提高接头质量；接头剪切强度可达78 MPa以上。随后，在450 ℃、应变速率为0.003 s-1下超塑成形，得到了结合良好的2B06铝合金中空双层结构件。

Based on the advantages of DB&SPF combination process, the preparation of double-layer structural part for 2B06 aluminum alloy was realized by the method of surface alkaline cleaning pretreatment removing oxide film. Then, the influences of surface roughness and diffusion temperatures on the microstructures and properties of diffusion bonding joints for 2B06 aluminum alloy were studied, and the most suitable process parameters of diffusion bonding were obtained. Furthermore, the process parameters of 2B06 aluminum alloy superplastic forming were determined by high temperature uniaxial tensile test and finite element simulation fitting method and so on. The results show that the best diffusion bonding effect is obtained with the bonding pressure of 5 MPa, the maintaining time of 2.5 h and the diffusion temperature of 500~530 ℃, and the oxygen concentration at the joint position effectively decreases by lower surface roughness to improve the quality of joint. However, the shear strength of joint reaches above 78 MPa. Finally, the superplastic forming is performed at 450 ℃ under the strain rate of 0.003 s-1, and the double-layer structural part of 2B06 aluminum alloy with high quality is obtained.

基金项目：

国家自然科学基金资助项目（51875122）

王国峰（1973-），男，博士，教授，博士生导师 E-mail：gfwang@hit.edu.cn

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