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Metals 2016, 6(8), 180; doi:10.3390/met6080180

Differential Scanning Calorimetry and Thermodynamic Predictions—A Comparative Study of Al-Zn-Mg-Cu Alloys

1
Institute of Nonferrous Metallurgy, Montanuniversitaet Leoben, Franz-Josef-Str. 18, Leoben 8700, Austria
2
Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 4, Zürich 8093, Switzerland
3
AMAG rolling GmbH, P.O. Box 32, Ranshofen 5282, Austria
*
Author to whom correspondence should be addressed.
Academic Editor: Nong Gao
Received: 31 May 2016 / Revised: 28 July 2016 / Accepted: 29 July 2016 / Published: 3 August 2016
(This article belongs to the Special Issue Aluminum Alloys)
View Full-Text   |   Download PDF [2471 KB, uploaded 4 August 2016]   |  

Abstract

Al-Zn-Mg-Cu alloys are widely used in aircraft applications because of their superior mechanical properties and strength/weight ratios. Commercial Al-Zn-Mg-Cu alloys have been intensively studied over the last few decades. However, well-considered thermodynamic calculations, via the CALPHAD approach, on a variation of alloying elements can guide the fine-tuning of known alloy systems and the development of optimized heat treatments. In this study, a comparison was made of the solidus temperatures of different Al-Zn-Mg-Cu alloys determined from thermodynamic predictions and differential scanning calorimetry (DSC) measurements. A variation of the main alloying elements Zn, Mg, and Cu generated 38 experimentally produced alloys. An experimental determination of the solidus temperature via DSC was carried out according to a user-defined method, because the broad melting interval present in Al-Zn-Mg-Cu alloys does not allow the use of the classical onset method for pure substances. The software algorithms implemented in FactSage®, Pandat™, and MatCalc with corresponding commercially available databases were deployed for thermodynamic predictions. Based on these investigations, the predictive power of the commercially available CALPHAD databases and software packages was critically reviewed. View Full-Text
Keywords: aluminium alloys; Al-Zn-Mg-Cu alloys; CALPHAD; differential scanning calorimetry aluminium alloys; Al-Zn-Mg-Cu alloys; CALPHAD; differential scanning calorimetry
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kolb, G.K.-H.; Scheiber, S.; Antrekowitsch, H.; Uggowitzer, P.J.; Pöschmann, D.; Pogatscher, S. Differential Scanning Calorimetry and Thermodynamic Predictions—A Comparative Study of Al-Zn-Mg-Cu Alloys. Metals 2016, 6, 180.

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