Study on Mechanical Relaxations of 7075 (Al–Zn–Mg) and 2024 (Al–Cu–Mg) Alloys by Application of the Time-Temperature Superposition Principle

Table 5

Characteristic parameters of the Debye peaks in Figure 9(a), associated with a hypothetical mechanical relaxation. The values of and were fitted empirically. Only at 375°C was fitted empirically, while at 350 and 365°C was obtained with an Arrhenius equation for ((4)) with activation energy 0.60 eV/at.

Temperature	[s]	[GPa]	[GPa]	[GPa^−1]	[GPa^−1]
375°C	0.50	61.5	53.6
365°C	0.59	64.5	56.9
350°C	0.77	65.3	57.9