Study on the Microstructure and Wettability of an Al-Cu-Si Braze Containing Small Amounts of Rare Earth Erbium |
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Authors: | Yaowu Shi Yang Yu Yapeng Li Zhidong Xia Yongping Lei Xiaoyan Li Fu Guo |
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Affiliation: | (1) School of Materials Science and Engineering, Beijing University of Technology, 100 Ping Le Yuan, Chaoyang District, Beijing, 100022, People’s Republic of China |
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Abstract: | The effect of adding small amounts of rare earth Er on the microstructure of an Al-Cu-Si braze alloy has been investigated.
Several Al-20Cu-7Si braze alloys containing various contents of Er were prepared, and their melting temperature, microstructure,
hardness, and wettability in contact with 3003 aluminum alloy substrates were determined. The results indicate that the constituents
of the microstructure of Al-20Cu-7Si-Er braze alloys are similar to those in the Al-20Cu-7Si alloy, and comprise of solid
solutions of aluminum, silicon, and the intermetallic compound CuAl2. When the Er content increases, the size of the Al phase decreases, and the needle-like Si phase is thickened, and transformed
to a blocky shape. Moreover, small amounts of Er can improve the wettability and hardness of the Al-20Cu-7Si braze alloy;
however, the melting temperature of the Al-20Cu-7Si alloy does not change. |
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Keywords: | Al-Si-Cu braze erbium microstructure rare earth |
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