Investigations on the Hot Stamping of AW-7921-T4 Alloy Sheet

Table 3

Condition and precipitate microstructure for AW-7921 sheet for the various tempers, as discerned from the DSC measurements.

Temper	Precipitate microstructure
SHT + WQ: W-temper	Zn and Mg solutes
SHT + WQ + 2-week storage: T4-temper	GP Zone
HF + DQ @ 10 mm/s + two-week storage	GP Zone
1-SPB	η′ precipitate
3-SPB	η′ precipitate
T6	η′ precipitate