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Temperature Difference between first and second reheating in

Temperature Difference between first and second reheating in

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Figure 2: DFSC experiments performed with alloy EN AW 7049A, cooling...
Figure 3: Excess enthalpy as a function of temperature from Pyris-1 DSC...
Figure 4: Modified DFSC program, consisting of two additional reheating...
Figure 5: Temperature Difference between first and second reheating in
Figure 6: Integrals (peak area) over the temperature difference curves as a
Monitoring Precipitation during Rapid Quenching of Aluminium Alloys by Calorimetric Reheating Experiments
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  • Jan 2012
Several age hardening aluminium alloys, like high alloyed 2XXX, 6XXX and 7XXX alloys require high critical quenching rates of some 100 K/s from solution annealing to suppress premature precipitation and achieve maximum strength after aging. Knowledge of the precipitation behaviour during quenching is crucial for the design of quenching processes of...
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... cooling starts at a temperature where the sample is in equilibrium and heating ends at the same temperature and equilibrium is reached again, • overcritical cooling must be for sure overcritical, • during the isotherm after cooling at the lowest temperature no precipitation occurs. Fig. 5 demonstrates results from differential reheating of alloy EN AW 7049A, showing the difference between first and second heating. The sample was solution annealed at 470° for 30 min, then cooled with the indicated rates to ambient temperature and reheated with 1000 K/s for both heating steps to solution annealing temperature again. The ...