Journal
MATERIALS
Volume 14, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/ma14082028
Keywords
superplasticity; aluminum alloys; transition metals; dispersoids; particle-stimulated nucleation
Categories
Funding
- Russian Science Foundation [20-79-00269]
- Russian Science Foundation [20-79-00269] Funding Source: Russian Science Foundation
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The addition of Ni in the Al-Mg-Si-Cu-based alloy was found to enhance superplasticity, improve grain morphology and distribution, and enhance elongation-to-failure under high temperature and large strain rate.
The current study analyzed the effect of Ni content on the microstructure and superplastic deformation behavior of the Al-Mg-Si-Cu-based alloy doped with small additions of Sc and Zr. The superplasticity was observed in the studied alloys due to a bimodal particle size distribution. The coarse particles of eutectic origin Al3Ni and Mg2Si phases with a total volume fraction of 4.0-8.0% and a mean size of 1.4-1.6 mu m provided the particles with a stimulated nucleation effect. The L1(2)- structured nanoscale dispersoids of Sc- and Zr-bearing phase inhibited recrystallization and grain growth due to a strong Zener pinning effect. The positive effect of Ni on the superplasticity was revealed and confirmed by a high-temperature tensile test in a wide strain rate and temperature limits. In the alloy with 4 wt.% Ni, the elongation-to-failure of 350-520% was observed at 460 degrees C, in a strain rate range of 2 x 10(-3)-5 x 10(-2) s(-1).
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