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Structure of cooled Zn-Al eutectoid based alloys in biphasic domain

M. AGAPIE1,* , I. PETER2, B. VARGA1

Affiliation

  1. Transilvania University, Material Science Department, 29 Eroilor Blvd., 500036, Brasov, Romania
  2. Applied Science and Technology, Politecnico di Torino, Torino 10129, Italy

Abstract

It is well-known that after solidification Zn-Al alloys, because of the high tendency of dendritic segregation, show a non-equilibrium structure with decomposition during the time. The eutectoid structure involves the presence of β phase, in the temperature interval of 275–430 ºC. In the present research paper a systematically analyses concerning the structural modifications in the eutectoid Zn-Al alloys upon quenching at various heating temperatures has been considered and presented. The heat treatments applied to the alloy allowed the maintaining of β phase at room temperature. Dilatometric and differential calorimetric (DSC) analyses have allowed the evaluation of the stability of metastable β phase and revealed the structural changes that occur during heating. The microstructural analyses were performed by Optical microscopy..

Keywords

Quenching, Microstructure, Dilatometric analysis, Differential calorimetric analysis, Zn-Al alloys, Phase transformation, β phase.

Submitted at: April 4, 2015
Accepted at: Oct. 28, 2015

Citation

M. AGAPIE, I. PETER, B. VARGA, Structure of cooled Zn-Al eutectoid based alloys in biphasic domain, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 11-12, pp. 1842-1848 (2015)