Precipitation strengthening in an ultralight magnesium alloy

Song Tang, Tongzheng Xin (), Wanqiang Xu, David Miskovic, Gang Sha, Zakaria Quadir, Simon Ringer, Keita Nomoto, Nick Birbilis and Michael Ferry ()
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Song Tang: The University of New South Wales
Tongzheng Xin: The University of New South Wales
Wanqiang Xu: The University of New South Wales
David Miskovic: The University of New South Wales
Gang Sha: Nanjing University of Science and Technology
Zakaria Quadir: Curtin University
Simon Ringer: The University of Sydney
Keita Nomoto: The University of Sydney
Nick Birbilis: Monash University
Michael Ferry: The University of New South Wales

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Body-centred cubic magnesium-lithium-aluminium-base alloys are the lightest of all the structural alloys, with recently developed alloy compositions showing a unique multi-dimensional property profile. By hitherto unrecognised mechanisms, such alloys also exhibit exceptional immediate strengthening after solution treatment and water quenching, but strength eventually decreases during prolonged low temperature ageing. We show that such phenomena are due to the precipitation of semi-coherent D03-Mg3Al nanoparticles during rapid cooling followed by gradual coarsening and subsequent loss of coherency. Physical explanation of these phenomena allowed the creation of an exceptionally low-density alloy that is also structurally stable by controlling the lattice mismatch and volume fraction of the Mg3Al nanoparticles. The outcome is one of highest specific-strength engineering alloys ever developed.

Date: 2019
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DOI: 10.1038/s41467-019-08954-z

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