Elasticity and internal friction of magnesium alloys at room and elevated temperatures

0488487 - ÚT 2019 RIV US eng J - Journal Article
Janovská, Michaela - Minárik, P. - Sedlák, Petr - Seiner, Hanuš - Knapek, M. - Chmelík, F. - Janeček, M. - Landa, Michal
Elasticity and internal friction of magnesium alloys at room and elevated temperatures.
Journal of Materials Science. Roč. 53, č. 11 (2018), s. 8545-8553. ISSN 0022-2461. E-ISSN 1573-4803
R&D Projects: GA ČR GA17-13573S
Institutional support: RVO:61388998
Keywords : Ab initio calculations * elevated temperature * high frequency HF * Mg-based alloy
OECD category: Materials engineering
Impact factor: 3.442, year: 2018
https://doi.org/10.1007/s10853-018-2136-4

Elastic moduli (Young’s modulus, shear modulus and bulk modulus) of three ultrafine-grained Mg-based alloys AZ31, AE42 and LAE442 were studied by resonant ultrasound spectroscopy. Evolution of these moduli and the corresponding high-frequency internal friction were measured in a temperature cycle between the room temperature and 310 °C, i.e., with heating above the recrystallization threshold temperature. The results reveal that the Li content in the LAE442 alloy has a strong impact on its elastic performance, resulting in a high E/ρ ratio, which is consistent with predictions of ab initio calculations. Simultaneously, the relaxation due to grain boundary sliding has significantly lower activation energy in LAE442 alloy.
Permanent Link: http://hdl.handle.net/11104/0285282