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Metals 2019, 9(2), 130; https://doi.org/10.3390/met9020130

Effect of Zr Addition on Overaging and Tensile Behavior of 2618 Aluminum Alloy

1
Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
2
Ferrari Auto SpA, Via Abetone Inferiore 4, 41053 Maranello, MO, Italy
3
Department of Materials Science and Engineering, Alfred Getz vei 2, Norwegian University of Science and Technology, 7491 Trondheim, Norway
4
Department of Industrial Engineering (DIN), University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
*
Author to whom correspondence should be addressed.
Received: 22 December 2018 / Revised: 18 January 2019 / Accepted: 22 January 2019 / Published: 26 January 2019
(This article belongs to the Special Issue Alloys for High-Temperature Applications)
Full-Text   |   PDF [3478 KB, uploaded 26 January 2019]   |  

Abstract

The effect of Zr addition on overaging and tensile behavior in a 2618 Al–Cu–Mg–Ni–Fe alloy has been investigated in this study. The chemical composition of the base 2618 alloy, containing ~0.1 wt % of Zr, was modified by adding Zr to reach the target content of 0.25 wt %. Cast bars were T6 heat-treated according to industrial parameters, involving soaking at 525 °C for 8 h, quenching in hot water (50 °C), and artificial aging at 200 °C for 20 h. Both the T6 2618 and 2618 + Zr alloys were overaged at 250 and 300 °C for up to 192 h, to evaluate the decrease in hardness with high temperature exposure time. The tensile behavior of the alloys was investigated in the overaged condition, both at room temperature and at 250 °C. The microstructure of the as-cast and solution-treated samples was investigated by optical and scanning electron microscopy, while the precipitate microstructure at the nanoscale was analyzed by transmission electron microscopy in overaged condition. Experimental data revealed that the presence of 0.25 wt % Zr does not induce modifications at the macroscale on the microstructure of 2618 alloy while, at the nanoscale, the presence of Zr-based precipitates was observed. The overaged Zr-enriched alloy showed increased yield and ultimate tensile strength in comparison to the base alloy, at equal heat treatment condition, both at room temperature and 250 °C. View Full-Text
Keywords: aluminum alloy; 2618; zirconium; overaging; high temperature; microstructure; tensile behavior aluminum alloy; 2618; zirconium; overaging; high temperature; microstructure; tensile behavior
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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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Toschi, S.; Balducci, E.; Ceschini, L.; Mørtsell, E.A.; Morri, A.; Di Sabatino, M. Effect of Zr Addition on Overaging and Tensile Behavior of 2618 Aluminum Alloy. Metals 2019, 9, 130.

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