Abstract
The work is devoted to studying the effect of a Sn trace addition on the precipitation hardening after aging of the eutectic Al-7 wt.% Si-7 wt.% Cu alloy. The addition of Sn and Si has a catalytic effect on the precipitation hardening and provides for a significantly higher hardness as compared with the binary Al-Cu alloy. The addition of 0.2 wt.% Sn leads to the formation of a substantially finer precipitation structure compared with the ternary alloy. As a result, the yield strength of the Sn containing alloy is up to 30% higher after uniaxial tensile tests. The finer precipitation structure of the quaternary alloy can be attributed to the higher stabilizing effect of Sn due to its partitioning in the θ″ and θ′ phases. The measured solubility of Sn (about 0.10 at.%) is close to the reported solubility of Si in θ′.
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21 March 2019
Torgom K. Akopyan’s name appeared incorrectly on the original published version of this article. It is corrected here.
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Acknowledgements
The authors gratefully acknowledge the financial support of the Ministry of Science and Higher Education of the Russian Federation in the framework of Increase Competitiveness Program of MISiS (No. P02-2017-2-10) (experimental and computational analysis of phase equilibrium) and State Task Project No. 11.2072.2017/4.6 (preparation of alloys and analysis of precipitation structure).
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Akopyan, T.K., Belov, N.A. & Letyagin, N.V. Effect of Trace Addition of Sn on the Precipitation Hardening in Al-Si-Cu Eutectic Alloy. JOM 71, 1768–1775 (2019). https://doi.org/10.1007/s11837-019-03422-x
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DOI: https://doi.org/10.1007/s11837-019-03422-x