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