7075 Alloy

Alloy name: 7075
Diagram No.: 607
Type of diagram: CCT
Chemical composition in weight %: 2.55% Mg, 5.44% Zn, 1.37% Cu, 0.15% Si, 0.39% Fe, 0.22% Mn, 0.21% Cr, 0.05% Ti, 0.02% Ni, balance is Al
Alloy group: Aluminium-based alloys
Note: CCT diagram for 7075 alloy. The curves at different cooling rates are plotted in one diagram (Fig.). The time-axis is scaled using logarithmic. Starting and finishing temperatures of phase transformation under the specific cooling rate are marked at corresponding cooling curves and connected by smooth line respectively. Solutionizing temperature and time, together with critical cooling rate are also marked. The constructed CCT diagram is presented in Fig., in which phase beta includes all possible secondary phases, such as MgZn2 and Al2CuMg. According to Fig., phase transformation takes place mainly in intermediate temperature range (170-430 C). Interrupted quenching process can be determined according to the established CCT diagram, so it is possible to decrease the quenching stress and to inhibit decomposition of solid solution.
Reference: Not shown in this demo version.

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