MICROSTRUCTURE AND MICROHARDNESS OF Al-7 ALLOY WT% BI
DOI:
https://doi.org/10.36773/1818-1112-2023-132-3-61-64Keywords:
aluminum, bismuth, iron, silicon, grain, microstructure, microhardnessAbstract
The microstructure and microhardness of the Al–7 wt % Bi alloy crystallized at an average melt cooling rate of ~10 K/s has been studied. Bismuth and iron precipitates are mainly localized at the boundaries of aluminum grains, the average size of which is 40 μm. Bismuth particles have a spherical shape. The average value of the diameters of their cross sections is 1.5 µm. The specific surface of grain boundaries is 0.12 µm-1. The specific surface area of the aluminum-bismuth interface is 0.062 µm-1. The microhardness of the alloy is (323 ± 13) MPa and decreases monotonically during isothermal annealing at 150 °C.
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