Precipitation strengthening in an ultralight magnesium alloy
| Autor: | Keita Nomoto, Song Tang, Zakaria Quadir, David M. Miskovic, Simon P. Ringer, Gang Sha, Tongzheng Xin, Michael Ferry, Wanqiang Xu, Nick Birbilis |
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| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Materials science Science Alloy General Physics and Astronomy Nanoparticle 02 engineering and technology engineering.material Article General Biochemistry Genetics and Molecular Biology 03 medical and health sciences Precipitation hardening Magnesium alloy lcsh:Science Quenching Multidisciplinary Precipitation (chemistry) Metallurgy General Chemistry Solution treatment 021001 nanoscience & nanotechnology 030104 developmental biology Volume fraction engineering lcsh:Q 0210 nano-technology |
| Zdroj: | Nature Communications Nature Communications, Vol 10, Iss 1, Pp 1-8 (2019) |
| ISSN: | 2041-1723 |
| Popis: | 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. Solution treatment and quenching can strengthen magnesium-lithium-aluminium alloys, but this strength decreases with ageing. Here, the authors show this is due to semi-coherent nanoparticle precipitation followed by coarsening, and control the lattice mismatch to stabilise the microstructure. |
| Databáze: | OpenAIRE |
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