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On the heat treatment and mechanical properties of a high solute Al–Zn–Mg alloy processed through laser powder bed fusion process

journal contribution
posted on 2023-10-26, 02:50 authored by AP Babu, A Huang, N Birbilis
High strength alloys in the Al–Zn–Mg system are primarily strengthened through artificial ageing by the formation of precipitates that are rich in Mg and Zn. In this work, a high solute Al–Zn–Mg alloy with 14 wt% Zn and 3 wt% Mg was prepared using the laser powder bed fusion process (LPBF). Heat treatment of Al–14Zn–3Mg revealed the presence of a high volume fraction of η’ and η-Mg(Zn, Al)2 precipitates in the Al-matrix, accompanied by a compromise of mechanical properties. This was elucidated in the context of microstructure – strength relationship, where the results demonstrate a loss of mechanical properties in aluminium alloys when the area fraction of second phases exceeds ~50%. This study is a discrete effort towards revealing the critical solute limits of Zn and Mg in aluminium that are imperative to achieve high strength through second phase particles – a fundamental concept that maybe exploited in the future design of high strength Al-alloys through additive manufacturing.

History

Journal

Materials Science and Engineering: A

Volume

807

Article number

ARTN 140857

Location

Amsterdam, The Netherlands

ISSN

0921-5093

eISSN

1873-4936

Language

English

Publication classification

C1.1 Refereed article in a scholarly journal

Publisher

ELSEVIER SCIENCE SA