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HomeMaterials Science ForumMaterials Science Forum Vols. 794-796In Situ Isothermal Calorimetric Measurement of...

In Situ Isothermal Calorimetric Measurement of Precipitation Behaviour in Al-Mg-Si Alloys

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Abstract:

Isothermal time-temperature-precipitation (TTP) diagrams deliver important material data like temperature and time ranges critical for precipitation. During the last years an in-situ calorimetric method to record continuous cooling precipitation diagrams has been developed to application level by our group. However, isothermal TTP-diagrams were still determined by ex-situ analyses only. In this work in-situ measurements of precipitation reactions were carried out during isothermal soaking. Therefore the whole heat treatment cycle was performed in a differential scanning calorimeter (DSC). Al-Mg-Si-alloys 6063 and 6005A were analysed. Solution annealing and overcritical quenching to several temperatures between 450 °C and 250 °C was followed by isothermal soaking. Based on the heat flow curves during isothermal soaking TTP-diagrams were determined. Further microstructure investigations by scanning electron microscopy and hardness tests after artificial ageing were performed. Both alloys show similar results. In the TTP-diagramms three so-called ”C-curves” could be observed. Every C-curve is expected to represent precipitation of a different phase. Hardness and microstructure investigations correspond with the data of the TTP-diagramms.

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Periodical:

Materials Science Forum (Volumes 794-796)

Pages:

939-944

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.794-796.939

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Online since:

June 2014

Authors:

Lydia Giersberg*, Benjamin Milkereit, Christoph Schick, Olaf Kessler

Keywords:

6005A, 6063, Aging, Differential Scanning Calorimetry (DSC), Isothermal Time-Temperature-Precipitation Diagram, Quenching

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* - Corresponding Author

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