Rev. Met. Paris
Volume 99, Number 5, May 2002Science et Génie des Matériaux
Fatigue et environnement
|Page(s)||481 - 489|
|Published online||25 October 2002|
Structural hardening mechanisms of lead-cadmium-calcium alloys for battery grids
It is known that age-hardening in lead-calcium alloys proceeds in two stages. The first corresponds to two concomitant hardening transformations of discontinuous type and without precipitation. The second, is a lamellar reaction of precipitation of Pb3Ca. The ageing of lead-cadmium alloys is characterized by a continuous precipitation and a discontinuous transformation. The hardening process is followed by an overaging which consists of a discontinuous transformation with a reprecipitation of the Cd from the fine hardening precipitates of the same phases. With an aim of improving the mechanical and electrochemical properties of Pb-Ca alloys, we undertook a study of the influence of minor additions of cadmium on the age-hardening of these alloys. Two structural states were considered: as-cast condition, rehomogenized condition.
© La Revue de Métallurgie, 2002
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