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Diffusion Behavior of SN and SN-ZN in Aluminum Under Ultrasonic Vibration Action

Author: LiuYu
Tutor: ZuoJiuChun
School: Harbin Institute of Technology
Course: Materials Processing Engineering
Keywords: 2A12 aluminium alloys ultrasonic soldering vacuum evaporation diffusion behavior
CLC: TG454
Type: Master's thesis
Year: 2011
Downloads: 74
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Abstract


In this paper, ultrasonic soldering of 2A12 aluminum alloy plates with vacuum evaporated tin film and Sn-Zn film was studied respectively. Fine joints with ultrasonic assisted soldering were got by control the soldering parameters. And the diffusion behavior of Sn and Sn-Zn in aluminum was investigated by varying the holding time, ultrasonic time, the period of the ultrasonic vibration conducted on.The results show that pure tin mainly diffused along the aluminum grains boundary. It suggests that the ultrasonic time has the great influence during the diffusion of Sn in base aluminum. The ultrasonic vibration was applied on the period of holding process, maximum distance can reach 8.52μm. The result of diffusion of Sn-Zn in aluminum shows that zinc diffuse along the aluminum grains boundaries firstly, then to the center of grains. Next tin diffused along the path that zinc diffused. Therefore, element zinc will solute to the bond forming the Sn-Zn eutectic phase. When the grain boundary ofαAl phase is completely form Sn-Zn-Al eutectic phase, the grains ofα-Al phase will fall into the bond.The bond mainly composed by aluminum was got by control the soldering parameters. The joint was holding for 1 hour after soldering. And in the former 30 minutes, ultrasonic vibration was applied 2 seconds per 5 minutes. Meanwhile, the reason of the joint failed with vacuum evaporated tin film was revealed. It suggests that the poor wet ability of tin on the surface of aluminium will result the serious oxidation of the solder, which lead to the failure of soldering. In the period of holding the bond mainly composed by aluminum and Zinc was got through Extrusion. when thickness of Sn-Zn layer is 4.70μm, aluminum and Zinc can diffuse fully to the base metal.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > Brazing
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