STRUCTURAL HARDENING MECHANISM OF LEAD-CADIUM-CALCIUM-TIN-SILVER ALLOYS FOR BATTERY GRIDS
Journal Title: Journal of Science And Arts - Year 2011, Vol 16, Issue 3
Abstract
The reequilibration of supersatured Pb-Ca-Cd-Sn-Ag alloys was studied by several experimental methods: hardness measurements, optical and electron microscopy, electron microprobe. Two structural states were considered; as-cast alloy, rehomogenised alloy. The explored temperatures were 20 and 80°C. In addition, the processes of age hardening of the PbCaCdSnAg alloys are done in two stages. The first stage is characterized by a discontinuous transformation without precipitation and a continuous reaction. The second is done by a coarse discontinuous reaction. The influence of the sliver results in an acceleration in the kinetics of the hardening transformations and a light increase in hardness. The effect of the rehomogeneisation results in an acceleration in the kinetics of the processes of ageing and over-aging thus involving a light increase in hardness. This acceleration in the kinetics is due primarily to continuous precipitation.
Authors and Affiliations
ADIL BALHAMRI, ELMADANI SAAD, ABDESSETIR DERAOUI, EL MOSTAFA OUALIM, LAHCEN BOUIRDEN, EL MOKHTAR HILALI
Keywords
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