Microstructure evolution and mechanical properties of ultrasonic-assisted soldering joints of 2024 aluminum alloys  

2024铝合金超声辅助钎焊接头的微观组织演变及力学性能(英文)

作　　者：李远星[1] 赵维巍[1] 冷雪松[1] 付秋娇[1] 王雷[1] 闫久春[1] 

机构地区：[1]哈尔滨工业大学现代焊接生产技术国家重点实验室,哈尔滨150001

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第9期1937-1943,共7页中国有色金属学报（英文版）

基　　金：Projects(51075104,50975054) supported by the National Natural Science Foundation of China;Project(2010RFQXG020) supported by the Harbin Excellence Talents Program,China

摘　　要：Ultrasonic-assisted soldering of 2024 aluminum alloys using a filler metal of Zn-5Al alloy was investigated at the temperature of 400 ℃,which is lower than the solution strengthening temperature of Al-Cu alloys.The ultrasonic vibration with power of 200 W and vibration amplitude of 15 μm at the frequency of 21 kHz was applied on the top samples.The ultrasonic vibration promoted the dissolution of Al elements in the base metal.The reduction of volume fraction of the eutectic phases in the bonds was investigated by increasing ultrasonic vibration time.As the ultrasonic vibration time increased from 3 s to 30 s,the volume fraction of the eutectic phase in the bonds decreased from 12.9% to 0.9%,and the shear strength of the joints was up to 149-153 MPa,increased by 20%.The improvement of the mechanical properties of joints was discussed based on the modulus and hardness of the phases in the bonds and the fracture of the joints.对低温下采用Zn-5Al钎料超声辅助钎焊2024铝合金进行研究。在温度为400℃时,采用功率为200W、振幅为15μm、频率为21kHz的超声对试样实施连接。采用超声波来加速Al从母材到焊缝的溶解,从而改变接头的微观组织。同时,通过增加超声时间来降低接头中共晶组织的含量。当超声振动时间从3s增加到30s时,焊缝中共晶相的含量从12.9%减少到0.9%剪切强度提高了20%,并且,当超声振动时间为30s时,接头的剪切强度达到最大为149-153MPa。为了研究接头力学性能的变化,测试了接头中各相的弹性模量和硬度,同时分析了不同超声振动时间下的接头断口形貌。

关 键 词：2024 aluminum alloys BRAZING SOLDERING ultrasonic-assisted soldering Zn-5Al filler metal 

分 类 号：TG407[金属学及工艺—焊接]