The effect of sample preparation on the DSC analysis of 6061 alloy

Effect of cold rolling on the formation and distribution of nanoclusters during pre-aging in an Al–Mg–Si alloy

“…The formation behavior of nanoclusters has also been studied by means of thermal analysis [13,[20][21][22][23][24]. Dutta and Allen found an exothermic peak from 303 to 413 K and proposed that one type of vacancysilicon clusters, ''Si-cluster'', were formed [13].…”

“…Dutta and Allen found an exothermic peak from 303 to 413 K and proposed that one type of vacancysilicon clusters, ''Si-cluster'', were formed [13]. However, the two exothermic peaks which are associated with the presence of two types of nanoclusters have not been observed in other thermal analyses [13,[20][21][22][23][24] because the majority of these studies did not start the scan below RT. The DSC results also demonstrated that the two types of nanoclusters possess different thermal stabilities in that cluster(1) is stable at the BH temperature, whereas cluster(2) easily transforms into the b 00 phase.…”

Optimization of the pre-aging treatment for an AA6022 alloy at various temperatures and holding times

“…5 show DSC curves obtained at a heating rate of 10 C/min of these selected samples after pre-aging and RT storage. In contrast to the sample without pre-aging, a dissolution trough between 180 and 200 C, which came from the reversion of the Cluster(1), was largely reduced or disappeared in the pre-aging samples, suggesting that pre-aging had effectively suppressed the formation of Cluster(1) [11]. The exothermic peak between 240 C-260 C, reported as the precipitation of b 00 phase [15], shifted to lower temperatures and became smaller with increasing pre-aging temperature.…”

“…The preaging treatments have been widely investigated and used in industrial production. Birol [11] revealed that pre-aging in a wide temperature range (60e200 C) was effective in improving the BHR of the twin-roll cast 6016 sheet. A pre-aging treatment between 140 C and 180 C for <10 min were claimed to be optimum for this alloys as it offered a nice BHR without impairing the formability in T4 temper.…”

Influência Da Deformação Plástica Severa No Endurecimento Por Precipitação De Uma Liga Aa6061

“…Dutta e Allen [9], analisando uma liga 6061 na condição solubilizada e sob a mesma taxa de aquecimento deste trabalho identificaram os picos que se apresentaram nestas mesmas temperaturas como sendo correspondentes à precipitação das fases metaestáveis  e , respectivamente. Este resultado foi confirmado por Birol [10]. Um fato importante que se observa em todas as amostras das condições S que foram deformadas é a ocorrência de apenas um pico de precipitação, o qual ocorre em temperaturas mais baixas do que a do pico da fase .…”