Analysis of the microstructural evolution and solidification behaviour of Sn-9 wt% Zn alloy with small additions of Mg
The microstructure, solidification behaviour and hardness of Sn-9Zn-xMg (where x = 0, 0.5, 2.5 and 5 wt%) alloys were studied. The addition of 0.5 wt% did show a clear effect on the microstructure, producing three distinctive zones: a) fine eutectic structure b) coarse eutectic structure...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2013-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2013/1450-53391300031F.pdf |
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| Summary: | The microstructure, solidification behaviour and hardness of Sn-9Zn-xMg
(where x = 0, 0.5, 2.5 and 5 wt%) alloys were studied. The addition of 0.5
wt% did show a clear effect on the microstructure, producing three
distinctive zones: a) fine eutectic structure b) coarse eutectic structure
composed by large needles of Zn dispersed into a b-Sn matrix and c) small
particles of the intermetallic Mg2Sn. The further additions Mg provoked that
the fine eutectic structure disappeared giving place to the formation a
coarse eutectic structure, large particles of Mg2Sn and Zn-rich needles. The
hardness of the alloys increased with the additions of Mg. Similarly, the
additions of Mg steadily drop the eutectic temperature, from 196.5ºC for the
binary base alloy to 180ºC for the alloy with 5 wt% Mg. The low temperature
achieved in this alloy is very close to the eutectic Sn-Pb alloy (183ºC),
thus it could be a plausible substitute of the classical Pb-containing solder
alloys. |
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| ISSN: | 1450-5339 |