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 5MPa,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.
作者
王国峰
张建威
张晓巍
李骁
王海伦
Wang Guofeng;Zhang Jianwei;Zhang Xiaowei;Li Xiao;Wang Hailun(School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;Shenyang Aircraft Corporation,Shenyang 110034,China;Capital Aerospace Machinery Corporation Limited,Beijing 100076,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2020年第7期187-192,共6页
Forging & Stamping Technology
基金
国家自然科学基金资助项目(51875122)。
关键词
2B06铝合金
双层结构件
DB&SPF组合工艺
扩散连接
超塑成形
剪切强度
2B06 aluminum alloy
double-layer structural part
DB&SPF combination process
diffusion bonding
superplastic forming
shear strength
