The Effect of Deformation Regime on the Contributions of Superplastic Deformation Mechanisms in AA5083-Type Aluminum Alloy

Abstract:

The superplastic deformation behavior, microstructure evolution in the volume and on the FIB-milled surface of the samples of fine-grained AA5083-type alloy with an initial grain size of ~5 µm were investigated, and the role of deformation mechanisms was discussed for two superplastic deformation regimes (1) a strain rate of 1×10^-3 s^-1 and a temperature of 0.87T_i.m. and (2) a strain rate of 5×10^-3 s^-1 and a temperature of 0.97T_i.m.. The m values were ~0.45-0.55 and elongations to failure were ~300% and ~600% for the first and second regimes, respectively. According to the shifts of the marker grid lines after straining to e=0.41, GBS contributed ~33% and ~23% to the total strain in the low-temperature and high-temperature deformation, respectively. The dislocation-induced intragranular deformation provided ~30% for the low temperature regime and ~20 % for the high temperature regime, and remaining 30-50% of strain was localized in the striated zones formed at the across grain boundaries due to both GBS and diffusion creep deformation mechanisms. Considering the strain induced by grain elongation for the low and high temperature deformation regimes, it was concluded that diffusion creep contributed 23% and 34% of the total deformation, and the recalculated GBS contribution, including both FIB grid shifts and a portion of the strain localized in the striated regions, was 43% and 38%, respectively.

• Periodical: Diffusion Foundations and Materials Applications (Volume 39)
• Pages: 11-21
• DOI: https://doi.org/10.4028/p-ms5gTi
• Online since: January 2026
• Authors: Olga A. Yakovtseva, Zarnigor Turaeva, Eugene S. Statnik, Artemy V. Irzhak, Anastasia V. Mikhaylovskaya*
• Keywords: Aluminum, Diffusion Creep, Dislocation Slip, FIB Milled Grids, Grain Boundary Sliding, Microstructure, Superplasticity

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