AA7136 Alloy

Alloy name: AA7136
Diagram No.: 761
Type of diagram: TTT
Chemical composition in weight %: 0.029% Si, 0.073% Fe, 2.152% Cu, 1.936% Mg, 8.542% Zn, 0.127% Zr, 87.06% Al
Alloy group: Aluminium-based alloys
Note: Calculated TTT Diagram for (top) AA7136 and (bottom) AA7075 using JMatPro.
The composition of the as-received AA7136 presented in upper text and AA7075 was analyzed by JMatPro and the calculated TTT diagram is shown in Figure. The diagrams show the start of transformation (0.5% amount of phase formed) of various phases from the supersaturated Al phase. At temperatures below 180oC, the GP zone formation is favored and the kinetics are very rapid. The precipitation hardening mechanisms in 7000 alloys are based on three phases or the metastable forms of these phases; (1) Eta-MgZn2, (2) T-AlCuMgZn and (3) S-Al2CuMg. The results of the AA7136 TTT diagram were used in determining a test matrix for aging heat treatment.
Reference: Not shown in this demo version.

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