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.
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This work was financially supported by the Czech Science Foundation Project Nos. 17-13573S and 14-13415S and by ERDF under the project “Nanomaterials centre for advanced applications,” Project No. CZ.02.1.01/0.0/0.0/15_003/0000485.
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Janovská, M., Minárik, P., Sedlák, P. et al. Elasticity and internal friction of magnesium alloys at room and elevated temperatures. J Mater Sci 53, 8545–8553 (2018). https://doi.org/10.1007/s10853-018-2136-4
- Alloy LAE442
- Grain Boundary Sliding (GBS)
- Resonant Ultrasound Spectroscopy (RUS)
- Equal Channel Angular Pressing (ECAP)
- ECAP Passes