Interfacial IMC growth behavior and mechanical properties of Cu/Sn58Bi/Cu and Cu/Sn58Bi–0.05AlN/Cu solder joints under ultrasonic-assisted soldering

Wang, Xi; Zhang, Liang; Chen, Chen; Lu, Xiaoping; Long, Weimin

doi:10.1007/s10854-022-09609-4

Cited by 1 publication

(1 citation statement)

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“…The formation of a joint involves a process of diffusion between Ga and Mg to form IMCs. Similar to the low-temperature joining of copper [23][24][25][26], the formation of IMCs makes the joining of magnesium alloys successful at low temperatures. Before applying ultrasound, wetting had already occurred between the solder and base metals due to the affinity between them.…”

Section: Microstructure Of Jointmentioning

confidence: 99%

Microstructure and Properties of Magnesium Alloy Joints Bonded by Using Gallium with the Assistance of Ultrasound at Room Temperature

Fang,

Guo,

Zhao

et al. 2023

Materials

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Although magnesium alloys show potential as structural and functional materials, they are difficult to join using traditional welding methods because of their low melting points and active chemical properties. Their poor weldability impedes their universal application. Ultrasound-assisted transient liquid-phase bonding (U-TLP) is a novel method used for magnesium alloy bonding, but in almost all related studies, a heating device has been required, and the types of solders are limited. In this study, gallium was used as solder to bond AZ31 magnesium alloy with ultrasonic assistance at room temperature (without a heating device) due to the low melting temperature of gallium and its compatibility with other metals when forming intermetallic compounds (IMCs). The variations in the products, microstructure, fracture characteristics, and shear strength of the joints were investigated. A reliable joint composed of IMCs (Mg2Ga5, H-MgGa2, and Mg2Ga) and a eutectic structure was obtained after an ultrasonic duration of 3 s. Significantly, the plasticity of the joint was improved due to ultrasonic effects, which included the accelerated element diffusion process, the refinement of grains to nanometer particles, and the homogenization of organization. Thus, the highest shear strength of 14.65 MPa at 4 s was obtained, with obvious cleavage fracture characteristics in the region of the IMCs.

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Section: Microstructure Of Jointmentioning

confidence: 99%