A Differential Scanning Calorimetry Study of Guinier Preston Zone Formation and Dissolution in 7075 and 7091 Aluminum Alloys.
NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIRCRAFT AND CREW SYSTEMS TECHNOLOGY DIRECTORATE
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The aging behavior of PM 7091 and IM 7075 aluminum were studied by DSC also hardness and conductivity. The energy associated with the formation and dissolution of Guinier Preston zones is correlated to mechanical and physical properties equations for conductivity and hardness as a function of heat of reaction are presented. The activation energy fo GP dissolution was established by differential scanning calorimetry DSC and values for delta H, deltaG, and deltaS were calculated using absolute reaction rate theory. The activation energy calculated for GP disolution in 7075-T6 is equivalent to the activation energy reported for the diffusion of Zn in aluminum.
- Properties of Metals and Alloys