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Optimisation of heat treatment of Al–Cu–(Mg–Ag) cast alloys
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0002-1190-836X
Department of Industrial Engineering (DIN), Alma Mater Studiorum - University of Bologna, Bologna, Italy.
Department of Industrial Engineering (DIN), Alma Mater Studiorum - University of Bologna, Bologna, Italy.
Department of Industrial Engineering (DIN), Alma Mater Studiorum - University of Bologna, Bologna, Italy.
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2019 (English)In: Journal of thermal analysis and calorimetry (Print), ISSN 1388-6150, E-ISSN 1588-2926Article in journal (Refereed) Epub ahead of print
Abstract [en]

The optimisation of heat treatment parameters for Al–Cu–(Mg–Ag) cast alloys (2xxx) having different microstructural scales was investigated. Thermo-Calc software was used to design optimal alloy compositions. Differential scanning calorimetry (DSC), scanning electron microscopy and wavelength-dispersive spectroscopy technique were employed to determine proper solution heat treatment temperature and homogenisation time as well as incidence of incipient melting. Proper artificial ageing temperature for each alloy was identified using DSC analysis and hardness measurement. Microstructural scale had a pronounced influence on time and temperature required for complete dissolution of Al2Cu and homogenisation of Cu solute atoms in the α-Al matrix. Refined microstructure required only one-step solution treatment and relatively short solution treatment of 10 h to achieve dissolution and homogenisation, while coarser microstructures desired longer time. Addition of Mg to Al–Cu alloys promoted the formation of phases having a rather low melting temperature which demands multi-step solution treatment. Presence of Ag decreases the melting temperature of intermetallics (beside Al2Cu) and improvement in age-hardening response. Peak-aged temperature is primarily affected by the chemical composition rather than the microstructural scale. 

Place, publisher, year, edition, pages
Springer, 2019.
Keywords [en]
Artificial ageing, Cast Al–Cu alloys, Coarseness of microstructure, DSC, Solidification rate, Solution treatment, Thermal treatment, Age hardening, Aluminum alloys, Binary alloys, Copper alloys, Differential scanning calorimetry, Dissolution, Melting point, Microstructure, Scanning electron microscopy, Silver alloys, Wavelength dispersive spectroscopy, Chemical compositions, Cu alloy, Heat treatment parameters, Low melting temperatures, Refined microstructure, Solution treatments, Heat treatment
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-46240DOI: 10.1007/s10973-019-08702-xScopus ID: 2-s2.0-85072042594Local ID: ;JTHMaterialISOAI: oai:DiVA.org:hj-46240DiVA, id: diva2:1352318
Available from: 2019-09-18 Created: 2019-09-18 Last updated: 2019-09-18

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Zamani, MohammadrezaSeifeddine, Salem

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