title: Rapid ultrasound-induced transient-liquid-phase bonding of Al-50Si alloys with Zn interlayer in air for electrical packaging application.
abstract: Al-50Si alloys were joined by rapid ultrasound-induced transient-liquid-phase bonding method using Zn foil as interlayer at 390°C in air, below the melt point of interlayer. The fracture of oxide films along the edge of Si particles led to contact and inter-diffusion between aluminum substrate and Zn interlayer, and liquefied Zn-Al alloys were developed. The width of Zn-Al alloys gradually decreased with increasing the ultrasonic vibration time due to liquid squeezing out and accelerated diffusion. A stage of isothermal solidification existed, and the completion time was significantly shortened. In the liquid metal, the acoustic streaming and ultrasonic cavitations were induced. As the process developed, much more Si particles, which were particulate-reinforced phases of Al-50Si, gradually migrated to the center of soldering seam. The highest average shear strength of joints reached to 94.2MPa, and the fracture mainly occurred at the base metal.
authors: School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
authors: Qian
authors: Q
authors: Wang
authors: State Key Lab of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China.
authors: Xiaoguang
authors: X
authors: Chen
authors: School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
authors: Lin
authors: L
authors: Zhu
authors: State Key Lab of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China.
authors: Jiuchun
authors: J
authors: Yan
authors: School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
authors: Zhiwei
authors: Z
authors: Lai
authors: Chinalco Research Institute of Science and Technology, Beijing 102209, China.
authors: Pizhi
authors: P
authors: Zhao
authors: School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
authors: Juncheng
authors: J
authors: Bao
authors: School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
authors: Guicai
authors: G
authors: Lv
authors: School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
authors: Chen
authors: C
authors: You
authors: School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
authors: Xiaoyu
authors: X
authors: Zhou
authors: State Key Lab of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China.
authors: Jian
authors: J
authors: Zhang
authors: School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China. Electronic address: hit_doctor_job@163.com.
authors: Yuntao
authors: Y
authors: Li
keywords: Joining; Mechanical properties; Microstructures; Particle-reinforcement; Ultrasound