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Influence of the AL3(Sc,Zr) dispersoids and the stretching on the natural ageing behavior of a binary AL-4WT%CU alloys

conference contribution
posted on 2018-01-01, 00:00 authored by B Rouxel, K Mester, A Vahid, J Lamb, T Langan, Thomas DorinThomas Dorin
© The Minerals, Metals & Materials Society 2018. Aluminum alloys are extensively used in the aerospace industry due to their high specific strength. Combined scandium (Sc) and zirconium (Zr) additions result in the formation of nano-size Al3(Sc,Zr) dispersoids which considerably increase the mechanical properties of these alloys. Recent research on Al–Cu–Sc–Zr model alloys showed that these dispersoids accelerate the formation kinetics of the copper (Cu) rich precipitates and modify their precipitation sequence. In this work, the effect of Sc and Zr addition and of the stretching on the precipitation during natural ageing of an Al-4 wt%Cu is investigated. Hardness and tensile measurements are used to quantify the hardening kinetics from precipitate formation during natural ageing. Transmission electron microscopy and differential scanning calorimetry are used to characterize the formed precipitates. Although the work hardening experienced during the stretching was significantly higher in the Al–Cu–Sc–Zr alloy, the strength increment during natural ageing was higher in the binary Al–Cu alloy. The presence of Sc and Zr inhibits the formation of GP zones that can explain the lack of mechanical response during the natural ageing.

History

Event

Minerals, Metals & Materials Society. Conference (147th : 2018 : Phoenix, Arizona)

Volume

Part F4

Pagination

1601 - 1607

Publisher

Springer

Location

Phoenix, Arizona

Place of publication

Berlin, Germany

Start date

2018-03-11

End date

2018-03-15

ISSN

2367-1181

eISSN

2367-1696

ISBN-13

9783319722832

Language

eng

Publication classification

E1 Full written paper - refereed

Copyright notice

2018, Springer

Title of proceedings

TMS 2017 : Proceedings of the The Minerals, Metals and Materials Society 2018 147th Annual Meeting and Exhibition

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