Effect of Ag addition on phase transitions of the Cu-22.26 at.%Al-9.93 at.%Mn alloy

Author(s)

Silva, R. A. G. ^[1] ; Gama, S. ^[1] ; Paganotti, A. ^[1] ; Adorno, A. T. ^[2] ; Carvalho, T. M. ^[2] ; Santos, C. M. A. ^[2]

Affiliation

^[1] Univ Fed Sao Paulo, DCET, Sao Paulo, SP - Brazil

^[2] Univ Estadual Paulista, Inst Quim, DFQ, Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: Thermochimica Acta; v. 554, p. 71-75, FEB 20 2013.
• Web of Science Citations: 5

Abstract

The phase transitions that occur in the Cu-22.26 at.%Al-9.93 at.%Mn and Cu-22.49 at.%Al-10.01 at.%Mn-1.53 at.%Ag alloys after slow cooling were studied using differential scanning calorimetry at different heating rates, microhardness changes with temperature, magnetization changes with temperature, scanning electron microscopy and energy dispersion X-ray spectroscopy. The results indicated that the presence of Ag does not modify the transition sequence of Cu-Al-Mn alloy, introduces a new transition due to the (Ag-Cu)-rich precipitates dissolution at about 800K, and changes the mechanism of DO3 phase dissolution. This mechanistic change was analyzed and a sequence of phase transitions was proposed for the reaction. (C) 2013 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 11/11041-4 - Thermal, mechanical and magnetic behavior of a Cu-Al-Mn-Ag quaternary alloy
• Grantee: Ricardo Alexandre Galdino da Silva
• Support Opportunities: Research Grants - Young Investigators Grants