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This study aims at investigation of the hydrogen damage after dissolution annealing and two-stage aging in aluminum 7075 alloy. Dissolution annealing was performed at 500 to 575 C for duration of 1 to 20 hours. The first stage of twostage aging was performed at 180, 200 and 220 C for 30 minutes. The second stage was carried out at 120 and 150 C for 10, 15 and 20 hours. Structural characteristics and chemical composition of precipitates was investigated using SEM and EDS methods, * لوئسم تابتاکم پ تس یکینورتکلا : S.gholipourr@gmail.com D ow nl oa de d fr om ja m e. iu t.a c. ir at 2 3: 35 IR S T o n W ed ne sd ay D ec em be r 26 th 2 01 8 [ D O I: 10 .1 88 69 /a ca dp ub .ja m e. 35 .1 .1 ]

Evaluation of Hydrogen Damage in Aluminum 7075 Alloy after Dissolution Annealing and Two-stage Aging