Experimental Study of the Interaction between Recrystallization and Precipitation Processes of an AA8011 Commercial Alloy

Abstract

Phase changes in a commercial AA8011 alloy from different initial microstructure conditions were studied using thermoelectric power (Δ ), differential scanning calorimetry (DSC), and transmission electron microscopy (TEM) techniques with the purpose of obtaining evidence of the interaction between recovery-precipitation and recrystallization-precipitation processes occurring during nonisothermal heating at different rates. Thermoelectric power and its thermal derivative reflect this evidence by a displacement of the characteristic precipitation peaks, the recovery and recrystallization contributions remaining masked by the strong incidence of the iron precipitation on that property, while DSC measurements detect the emergence of new peaks not observed on thermograms of homogenized samples. An exhaustive study of these peaks permits direct differentiation between precipitation and recoveryrecrystallization contributions. TEM confirms the interaction between both processes by means of local observations.

Statistical patterns of deformation localization during plastic flow in the AMg6 alloy

“…Для исследования методом дифференциальной сканирующей калориметрии (ДСК) [15,16] Нагрев пластически деформированного материала инициирует механизм возврата и рекристаллизации, приводящий к появлению новых зёрен. Этим обусловлено высвобождение накопленной при пластической деформации энергии.…”

“…Этим обусловлено высвобождение накопленной при пластической деформации энергии. Для алюминиевых сплавов в области температур 300°С наблюдается экзотермическая реакция, связанная с осаждением фазы α-AlFeSi [16].…”

Aquilanti–Mundim deformed Arrhenius model in solid-state reactions

“…[7,[17][18][19], where for every reaction constant k(T) there is a single pair of values (d, e) reproducing those data. This paper, however, applies data from calorimetry measurements to determine the behavior of d-deformed parameters d and e. It particularly proposes the characterization of two phases appearing in the phase transformation sequence of the AA8011 alloy, whose DSC data were recently published by the author and collaborators [22][23][24]. The data selected correspond to homogenized samples of the AA8011 alloy, an aluminum alloy, whose main components are iron and silicon.…”

“…This paper proposes an approach to determine the kinetic parameters associated with the Aquilanti-Mundim deformed Arrhenius model and their drift from Arrhenius law in DSC solid-state reactions, with particular attention to GP zones and a-AlFeSi phase precipitation reactions in homogenized samples of the AA8011 alloy [22][23][24].…”