摘要
采用搅拌摩擦焊接技术进行了AA7075铝合金的焊接,针对搅拌摩擦焊接试样进行了拉压、弯曲和硬度测量实验,研究了AA7075铝合金在搅拌摩擦焊接过程中的组织演变和力学性能。实验及研究结果表明:焊接的强度高于母材15%,延展性为母材的50%,硬度相对于母材有所下降。在弯曲实验中,搅拌摩擦焊接之后的工件弯曲后更易产生裂缝。AA7075的微观组织演变主要体现在析出物尺寸和分布的变化。实验发现这些热影响区的析出物较为粗糙,而焊接区的析出物较为细小。
AA7075 aluminum alloy is a high-strength cold-treatment forging alloy, which has a wide applications in aerospace industry, advanced equipment manufacturing and other fields. In this paper, friction stir welding technology was used to weld AA7075 aluminum, and the tension and compression, bending and hardness measurement experiments of the friction stir welding samples were conducted to study the microstructure evolution and mechanical properties of AA7075 aluminum alloy in friction stir welding process. The results show that the strength of the welded specimens is more than15% of the base material, the ductility becomes 50% of the base material, the hardness decreases with respect to the base material. In the bending test, the workpiece after friction stir welding cracks more easily after bending. AA7075 microstructure evolution mainly reflected in the change of the size and distribution of precipitates. Precipitates in the heat-affected zone is rough, but precipitates in welding zone is relatively small.
出处
《铸造技术》
CAS
北大核心
2016年第6期1225-1228,共4页
Foundry Technology
