CAJ | 학술논문

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200 W、振幅为15μm、频率为21 kHz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30 s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30 s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.
대저온하채용Zn-5Al천료초성보조천한2024려합금진행연구.재온도위400℃시,채용공솔위200 W、진폭위15μm、빈솔위21 kHz적초성대시양실시련접.채용초성파래가속Al종모재도한봉적용해,종이개변접두적미관조직.동시,통과증가초성시간래강저접두중공정조직적함량.당초성진동시간종3s증가도30 s시,한봉중공정상적함량종12.9％감소도0.9％전절강도제고료20％,병차,당초성진동시간위30 s시,접두적전절강도체도최대위149-153MPa.위료연구접두역학성능적변화,측시료접두중각상적탄성모량화경도,동시분석료불동초성진동시간하적접두단구형모.
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 ofjoints was discussed based on the modulus and hardness of the phases in the bonds and the fracture of the joints.