Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 87: Issue 1
Calorimetric analyses on aged Al–4.4Cu–0.5Mg–0.9Si–0.8Mn alloy (AA2014 grade)
Authors:
Paola Bassani National Research Council Institute for Energetics and Interphases CNR-IENI Unit of Lecco Lecco Italy 29-23900 Corso P. Sposi

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E. Gariboldi Politecnico di Milano Dipartimento di Meccanica Milano Italy 20156 Via La Masa, 34

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G. Vimercati Politecnico di Milano Dipartimento di Meccanica Milano Italy 20156 Via La Masa, 34

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Pages:
247–253
Online Publication Date:
07 Feb 2007
Publication Date:
01 Jan 2007
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-006-7836-3
Keywords:
aluminium alloy 2014; DSC; overaging
Restricted access

Abstract  

An Al–4.4Cu–0.5Mg–0.9Si–0.8Mn alloy (IADS 2014 grade) in the solution annealed and peak aged condition was exposed at 170°C for relatively long times (up to about 1800 h) in order to check the stability of the alloy. The investigated aging temperature was in the frame of a research on the long-term mechanical behaviour of such alloy. Microstructure evolution was monitored via calorimetric analyses, metallographic inspections and hardness measurements. Further, X-ray analyses were carried out on selected samples. The attention was focused on differential scanning calorimetry performed at different scanning rates, with the aim of evaluating the kinetics of the precipitation phenomena. Notwithstanding the wide industrial diffusion of this alloy, literature survey showed that there is not a consensus view on the precipitation sequences and on calorimetric peak identification. The present results show the progressive evolution of calorimetric peaks, corresponding to that of strengthening particles towards more stable phases, proved by the disappearance of exothermic peaks. Activation energy from Kissinger kinetic analysis in the case of aged samples provided scattered values that could be reasonably attributed to an overlapping of transformation peaks. Moreover, in these samples transformations partially occurred before DSC scans, providing non-constant transformation fraction at signal peak temperatures and resulting in different activation energies.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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