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

Figure 9

From DMA tests on AA 7075-T6 at 350, 365, and 375°C: isothermal loss modulus versus logarithm of the frequency and Debye peaks as given by Debye equation (a); and storage modulus versus logarithm of the frequency as given by Debye equation (b). and are the unrelaxed and relaxed dynamic Young’s moduli, respectively.

(a)

(b)