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01-06-2015 | Issue 6/2015

Journal of Materials Engineering and Performance 6/2015

Preparation and Properties of a Novel Al-Si-Ge-Zn Filler Metal for Brazing Aluminum

Journal:
Journal of Materials Engineering and Performance > Issue 6/2015
Authors:
Zhiwei Niu, Jihua Huang, Hao Yang, Shuhai Chen, Xingke Zhao

Abstract

The study is concerned with developing a filler metal with low melting temperature and good processability for brazing aluminum and its alloys. For this purpose, a novel Al-Si-Ge-Zn alloy was prepared according to Al-Si-Ge and Al-Si-Zn ternary phase diagrams. The melting characteristics, microstructures, wettability, and processing property of the alloy were investigated. The results showed that the melting temperature range of the novel filler metal was 505.2-545.1 °C, and the temperature interval between the solidus and the liquidus was 39.9 °C. Compared with a common Al-Si-Ge alloy, it had smaller and better dispersed β-GeSi solid solution precipitates, and the Zn-rich phases distributed on the boundary of the β-GeSi precipitates. The novel filler metal has good processability and good wettability with Al. There was one obvious transition layer with a thin α-Al solid solution between the filler metal and base metal, which is favorable to improve the strength of brazing joint.

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