Influence of minor additions of tin (Sn) on the mechanical properties of lead alloys PbCaCdSb

 

E. Saad1*, M. Rattal2,3, S. Saissi1, K. Marbouh1, A. Jourani1, E.M. Oualim4

1 Laboratoire Physico-Chimie des Procédés et des Matériaux, Université Hassan 1er FST Settat, Maroc

2 Université Hassan 1er, Institut Supérieur des Sciences de la Santé, Settat, Maroc

3 Laboratoire Rayonnement & Matière, Université Hassan 1er FST Settat, Maroc

4 Université Hassan 1er, Ecole Supérieure de Technologie, Berrechid, Maroc

* Corresponding author. E-mail: saad_elmadani@hotmail.com

Received: 07 April 2014; revised version accepted: 29 July 2014

 

Abstract

     The structural hardening of lead alloys “PbCaCdSbSn” is characterized by two stages: the first is characterized by a discontinuous transformation hardening. The second is characterized by a softening discontinuous precipitation. The influence of minor additions of tin results in an increase of hardness and a kinetics acceleration of the two transformations characterizing the aging and the overaging PbCaCdSbSn alloy. Three structural states were considered: gross casting alloy, rehomogenized alloy and laminated alloy. The proportions are: 2% Cd, 2% Ca, 2% Sb and the tin (Sn) proportion are 1.5% and 2% (% means weight through in this study). The explored temperatures mainly 20, 80 and 100°C. The temperature of 80°C is chosen because it corresponds to the battery plates ripening temperature and the extreme temperature of working.

 

Keywords: Lead; Hardening; Transformation; Aging; Overaging.

 


 

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