Abstract
This study examines the evolution of dislocation density in cold rolled 1050 Al alloy. Various techniques such as numerical approaches, indentation techniques, X-ray diffraction line profile analysis, and electron backscattering diffraction were employed for the characterization of the deformed state. These methods allowed us to determine the nature of the evolution of the dislocation substructure during cold rolling. The investigated material was subjected to thickness reductions varying from 5% to 47%, which resulted in a continuous increase in hardness while the estimated dislocation density showed a tendency towards a less intense increase after a ~30% straining level. The numerical approaches employed, such as the Kubin–Estrin and a modified version of this model, are capable of ensuring a reasonable estimation of dislocation density at low and moderate deformation levels (~5–30%), while the discrepancy between the measured and simulated data is negligible when the material has been exposed to more severe rolling reductions.
Highlights
The extraordinary material properties of aluminum alloys, such as their strength to weight ratio, ductile nature, cryo-tolerance, corrosion resistance, and high energy absorption capacity, make them outstanding candidates in terms of their applicability in a wide range of products
The investigated materials were exposed to X-ray diffraction line profile analysis, which allows the dislocation density to be calculated by analyzing the broadening of diffraction lines by the method described in great detail in [6,8]
After the 15.8% reduction, the majority of high angle grain boundaries are aligned along the rolling direction (RD)
Summary
The extraordinary material properties of aluminum alloys, such as their strength to weight ratio, ductile nature, cryo-tolerance, corrosion resistance, and high energy absorption capacity, make them outstanding candidates in terms of their applicability in a wide range of products. For FCC materials with a high stacking fault energy (SFE), this mechanism of deformation induces the generation of one-dimensional lattice defects [4], known as dislocations, which tend to block the slippage of each other, and resist deformation [2,3]. In both hot and cold rolling, the formation of dislocations takes place, while the annihilation of dislocations occurs during the process of annealing [4]. The assessment of substructure evolution in metallic systems is of crucial importance
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