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

Autor(es)

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

Afiliação do(s) autor(es)

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

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

• Tipo de documento: Artigo Científico
• Fonte: Thermochimica Acta; v. 554, p. 71-75, FEB 20 2013.
• Citações Web of Science: 5

Resumo

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)

• Processo FAPESP: 11/11041-4 - Estudo do comportamento térmico, mecânico e magnético de uma liga quaternária de Cu-Al-Mn-Ag
• Beneficiário: Ricardo Alexandre Galdino da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores