Effect of Ag addition on phase transitions of the Cu-22.26 at.%Al-9.93 at.%Mn alloy
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2013-02-20
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Silva, R. A. G. [UNIFESP]
Gama, S. [UNIFESP]
Paganotti, A. [UNIFESP]
Adorno, A. T.
Carvalho, T. M.
Santos, C. M. A.
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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.
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Thermochimica Acta. Amsterdam: Elsevier B.V., v. 554, p. 71-75, 2013.