Continuous Heating Dissolution Diagrams of Aluminum Alloys

To describe dissolution processes and also possible precipitation processes during continuous heating of aluminum alloys over a wide range of heating rates new methods have to be developed. According to common continuous heating transformation diagrams of steels, continuous heating dissolution diagrams can provide information about the dissolution and precipitation behavior of aluminum alloys depending on heating rate. The method developed by Milkereit et al. for quenching experiments can be used, to establish continuous heating dissolution diagrams. Heating of aluminum alloys EN AW-6082 and 6005A has been investigated in the heating rate range from 0.01 to 5 K/s up to temperatures of about 580 °C in two different types of differential scanning calorimeters. The dissolution and precipitation behavior strongly depend on initial microstructure, e.g. T4 or T6, and on heating rate. The start temperatures of dissolution and precipitation reactions increased with increasing heating rate.