激光功率对铝/铜激光熔钎焊接头组织及性能的影响
Effect of Laser Power on Microstructure and Properties of Al/Cu Laser Welding-Brazing Joints
杜道忠 1张超 1周宇浩2
作者信息
- 1. 江苏城乡建设职业学院公用事业学院,常州 213003
- 2. 江苏科技大学材料科学与工程学院,镇江 212003
- 折叠
摘要
采用激光熔钎焊方法对5052铝合金和T2紫铜进行对接试验,研究了激光功率(2 000,2 200,2 400,2 600,2 800 W)对接头显微组织和力学性能的影响.结果表明:不同激光功率下接头铜侧钎焊区组织均以柱状晶为主,随着激光功率的增加,焊缝区树枝晶由细针状转变为雪花状;铜侧钎焊区由界面层和金属间化合物层组成,2 000,2 600 W激光功率下的界面层主要为AlCu相,金属间化合物层主要为Al4Cu9相,2 400 W激光功率下的界面层主要由AlCu相和CuZn相组成,金属间化合物层主要为CuZn5相;焊缝区主要由Al4.2Cu3.2Zn0.7和Al0.71Zn0.29相组成.随着激光功率的增加,金属间化合物层厚度增加.激光功率对铜侧钎焊区的显微硬度影响较大,各接头的最高显微硬度均出现在铜侧钎焊区.随着激光功率的增加,接头最高硬度增加,抗拉强度先增大后减小;当激光功率为2 400 W时,接头的抗拉强度最大,达到铝合金母材的92％,此时接头在靠近铝合金母材处断裂,而其他激光功率下制备的接头均在铜侧钎焊区和焊缝区处断裂.
Abstract
The welding test of 5052 aluminum alloy and T2 copper was carried out by laser welding-brazing.The effect of laser power(2 000,2 200,2 400,2 600,2 800 W)on the microstructure and mechanical properties of the joint was studied.The results show that under different laser powers,the microstructure of the brazing zone on the copper side of the joint was mainly columnar.With the increase of laser power,the dendrites in the weld zone changed from fine acicular shape to snowflake shape.The brazing zone on the copper side was composed of interfacial layer and intermetallic compound layer.The interfacial layer at 2 000 W and 2 600 W laser powers was mainly composed of AlCu phase,and the intermetallic compound layer was mainly composed of Al4 Cu9 phase.The interfacial layer at 2 400 W laser power was mainly composed of AlCu phase and CuZn phase,and the intermetallic compound layer was mainly composed of CuZn5 phase.The weld zone was composed of Al4.2 Cu3.2 Zn0.7 and Al0.71Zn0.29 phases.The thickness of intermetallic compound layer increased with the increase of laser power.The laser power had a great influence on the microhardness of the brazing zone on the copper side,and the maximum microhardness of each joint appeared in the brazing zone on the copper side.With the increase of laser power,the maximum hardness of the joint increased,and the tensile strength increased first and then decreased.When the laser power was 2 400 W,the tensile strength of the joint was the highest,reaching 92％of that of the aluminum alloy base metal.The joint welded at 2 400 W laser power fractured near the aluminum alloy base metal,while joints welded at other laser powers fractured at the copper side brazing zone and weld zone.
关键词
铝/铜异种金属接头/激光熔钎焊/激光功率/显微组织/力学性能Key words
Al/Cu dissimilar metal joint/laser welding-brazing/laser power/microstructure/mechanical property引用本文复制引用
基金项目
江苏省低碳建材与城乡生态工程研究中心项目(苏发改高技发[2021]1368号)
江苏城乡建设职业学院自然科学项目(206/XJZK23002)
常州市科技计划(CJ20230024)
出版年
2024
NETL
NSTL
万方数据