四川大学学报（自然科学版）2025，Vol.62Issue(4)：803-811,9.DOI:10.19907/j.0490-6756.250075
新Al-Mg焊材振荡激光焊接7075铝合金的组织及性能研究
Microstructure and properties of 7075 aluminum alloy welded with new Al-Mg filler material using oscillating laser welding
摘要
Abstract
Oscillating laser welding enhances the flow of the molten pool and improves the distribution of sol-ute elements through its stirring effect.In this study,7075-T6 aluminum alloy was welded using oscillating la-ser welding with a self-developed Al-Mg filler material.By integrating scanning electron microscopy(SEM),transmission electron microscopy(TEM),and thermodynamic calculations,the weld formation and micro-structure evolution were investigated.The results demonstrate that an oscillation amplitude of 0.8 mm en-sures complete melting of the filler material,while the oscillation frequency has minimal impact on the weld cross-sectional area.At an oscillation frequency of 200 Hz,the average grain size in the fusion zone is 17.9 μm.The oscillating process promotes the flow of Y in the molten pool,enhancing its solute-restricted growth effect.Furthermore,the stirring action results in a more homogeneous weld microstructure,achieving a ten-sile strength of 343 MPa and an elongation of 4.1%for the welded joint.Thermodynamic calculations reveal that the precipitation sequence in the weld is as follows:L→Al3Ti→Al13Cr2→Al10RM2→Mg2Si→Al4MgY→S_Al2CuMg→Al4Ca→T_AlMgZn.关键词
振荡激光焊接/7075铝合金/微观组织/力学性能/热力学计算Key words
Oscillating laser welding/7075 aluminum alloy/Microstructure/Mechanical properties/Ther-modynamic calculations分类
矿业与冶金引用本文复制引用
李传胜,王雷,伍亚辉,杨祥帆,于文晶,王利忠,王洪宝,张怀强,张英波..新Al-Mg焊材振荡激光焊接7075铝合金的组织及性能研究[J].四川大学学报（自然科学版）,2025,62(4):803-811,9.基金项目
航空装备先进材料与制造技术四川省国防科技重点实验室(2023KFKT0006) （2023KFKT0006）
四川省重大科技专项(2023ZDZX0003) （2023ZDZX0003）
