MECHANICAL PROPERTIES OF MELT-QUENCHED PB-BA-SN ALLOYS FOR GRIDS OF LEAD ACID BATTERIES
DOI:
https://doi.org/10.34185/1991-7848.itmm.2023.01.018Keywords:
lead-acid batteries, grids, alloying with Ba and Sn, annealing, precipitation hardening, mechanical properties.Abstract
Mechanical properties and structure of specimens of melt-quenched lead alloyed with Ba and Sn for batteries grids have been studied. It has been shown that during isothermal aging at 80°C alloys do show no tendency to recrystallize and lose strength. The results of studies of the phase composition have allowed us to propose a mechanism of alloy strengthening during the ageing process. Strengthening of the Pb–Ba–Sn alloys proceeds due to precipitation hardening and formation of Pb3Ba precipitates that further transform to inclusions of Sn5Ba phase. Barium has no modification effect on crystallization processes of the alloys. The grains of lead-based solid solution become finer because more crystallization nuclei form under higher overcooling.
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