The individual temperature ranges overlap: Even at low temperatures, there is formation of \theta'- or \theta phases, but these form much more slowly than the GP(I/II) zones. Each of the phases forms faster the higher the temperature.Friedrich Ostermann: Anwendungstechnologie Aluminium. 3. Auflage, Springer, 2014, S. 119 f.George E. Totten, D. Scott MacKenzie: Handbook of Aluminum – Band 1: Physical Metallurgy and Processes. Marcel Dekker, New York/Basel 2003, S. 140 f.
