Abstract
The effects of Mn addition on the microstructure and strengthening of AlCuYbZr and AlCuGdZr alloys were investigated. Novel Al80-88Cu8-12Yb3-4Mn and Al78-86Cu10-15Gd3-5Mn phases solidify in the alloys instead of the Al8Cu4Yb and Al8Cu4Gd phases. Alloying by Mn provided novel phase formation and redistribution of Cu between the Al solid solution and the intermetallic phases. Three types of precipitates were identified in the microstructure after heat treatment: Al3(Zr,Yb)/Al3(Zr,Gd), Al20Cu2Mn3, and θ′(Al2Cu). The high Cu content in the Al solid solution with a combination of the Al20Cu2Mn3 phase precipitates led to a 60-MPa to 80-MPa increase in YS relative to that of the Mn-free alloys.
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Acknowledgements
S.M. Amer is funded by a scholarship under the joint (exclusive program between Arab republic of Egypt and Russia).
Funding
The work was supported by the Russian Science Foundation (Project No. 21–79-00193).
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Amer, S.M., Mamzurina, O.I., Loginova, I.S. et al. Effect of Mn Addition on the Phase Composition and Strengthening Behavior of AlCuYbZr and AlCuGdZr Alloys. JOM 74, 3646–3654 (2022). https://doi.org/10.1007/s11837-022-05398-7
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DOI: https://doi.org/10.1007/s11837-022-05398-7