Development of a Continuous Cooling Transformation Diagram for an Al-Zn-Mg Alloy Using Dilatometry

Manoj Kumar; Nigel Ross; Iris Baumgartner

doi:10.4028/www.scientific.net/MSF.828-829.188

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HomeMaterials Science ForumMaterials Science Forum Vols. 828-829Development of a Continuous Cooling Transformation...

Development of a Continuous Cooling Transformation Diagram for an Al-Zn-Mg Alloy Using Dilatometry

Abstract:

To develop CCT diagram using DSC requires the use of multiple devices in order to measure across the range of cooling rates required to develop the diagram. In the current work one dilatometer is used to characterize the precipitation reactions of the AA7020 alloy. Precipitation and dissolution reactions resulted in changes in the rate of change in the coefficient of thermal expansion. This was used to determine the start and finish temperatures of the MgZn₂ precipitation reaction and produce the CCT diagram. Good agreement was found between the results of this technique and DSC results from the literature.

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Periodical:

Materials Science Forum (Volumes 828-829)

Pages:

188-193

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https://doi.org/10.4028/www.scientific.net/MSF.828-829.188

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Online since:

August 2015

Authors:

Manoj Kumar*, Nigel Ross, Iris Baumgartner

Keywords:

AA7020, CCT Diagram, Dilatometry, Phase Transformation

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