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Influence of microstructure on the mechanical properties and stress corrosion susceptibility of 7050 Al‐alloy

“…3. The major features are two endothermic peaks V and S together with an exothermic peak P. Exothermic peak P (225 to 260aeC) represents the formation of the equilibrium h phase [12][13][14], which is produced primarily during the DSC scan. The higher temperature endotherm, peak S, results from the dissolution of the h phase.…”

“…The higher temperature endotherm, peak S, results from the dissolution of the h phase. The peak V represents the dissolution of the GP zones and hø phase [12][13][14][15]. In the present work, we place the focus on the first endothermic reaction, peak V, since it describes the existing matrix precipitates.…”

“…In the present work, we place the focus on the first endothermic reaction, peak V, since it describes the existing matrix precipitates. For the T6-a sample, a typical doublet peak P is observed; the peak V (184aeC) is due to the dissolution of GP zones which are the predominant precipitates of the T6-a temper [13][14][15]. For the T6-b material, the peak V shifts to a higher temperature 202aeC and the endothermic reaction area at V also decreases, as compared to those of 162 the T6-a.…”

“…The T73 overaged material, as would be expected, has a maximum temperature of the endothermic peak V at 210aeC, which is associated with the dissolution of a large number of the hø precipitates. The T73 matrix was characterized by hø and h distribution [13][14][15]. For the RRA-a material, peak V shifts to 198aeC and becomes broader as compared to that of the T6-a.…”