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  • 1 Université de Toulon et du Var Laboratoire de Physico-Chimie du Matériau et du Milieu Marin, Matériaux à Finalité Spécifique (E. A. 1356) B. P. 132 83957 La Garde cedex France B. P. 132 83957 La Garde cedex France
  • 2 S. A. Metalor av. du Vignoble CH-2009 Neuchâtel Switzerland av. du Vignoble CH-2009 Neuchâtel Switzerland
  • 3 Centre de Thermodynamique et de Microcalorimétrie du CNRS 26 rue du 141 R.I.A 13331 Marseille cedex 3 France 26 rue du 141 R.I.A 13331 Marseille cedex 3 France
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Abstract  

A systematic study of Al-Zn-Sn ternary alloys by using a Tian-Calvet calorimeter with slow heating and cooling rate was carried out and supplemented by scanning electron microscopic observations. The results have shown that crystallization coupled with dissolution of tin into the αss′ ternary solid solution on heating is an endothermic process, while melting coupled with tin expulsion on cooling is an exothermic one. It seems that the thermal effects of phase transition are outweighed by much stronger ones due to a large composition change of the αss′ ternary phase.