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Structure-property relations in the Mg-Nd-Zn System

AuthorsTolnai, Domomkos
Rare Earth
synchrotron radiation
Issue Date4-Oct-2017
AbstractNeodymium, a Rare Earth with low solid solubility in Mg is an ideal alloying element to improve the yield strength and creep resistance cost effectively. The addition of Zn achieves a further improvement; however, its influence on the intermetallic phases in the Mg-Nd-Zn ternary system is not yet fully understood. A Mg-5Nd alloy modified with 3, 5 and 7 wt.% of Zn was produced in order to investigate the effect of Zn on the system. The internal architecture of the phases, their volume fraction and spatial distribution influences the macroscopic thermo-mechanical behaviour of the material. Therefore, understanding of the sequence of phase-formation and phase-evolution during solidification and processing is the first step towards microstructure engineering of these alloys. The solidification behaviour was investigated with in situ synchrotron radiation-diffraction and –tomography during cooling from the molten state to 200 °C in order to investigate the phase-formation and -transformation characteristics of the alloys. The synchrotron diffraction results have been complemented with TEM investigations on the as-solidified samples. The results suggest that Zn has a strong effect on the microstructure by stabilizing the Mg3Nd phase and accelerating the precipitation formation. The experimental results do not fully comply with the theoretical calculations, indicating the necessity of improving the thermodynamic databank for this alloy system. The deformation behaviour during processing was investigated by means of standard tensile and compression testing and with in situ synchrotron radiation diffraction at ambient and elevated temperatures. Azimuthal angle - time plots give information on grain structure changes that can be correlated with grain rotation, twinning, recovery and recrystallization. The results and post mortem EBSD maps from the samples suggest that the alloys deform by grain rotation and crystallographic slip at 200°C to obtain the final texture, while at room temperature twinning is the dominant deformation mechanism
DescriptionCiclo de Conferencias "Embajadores" del CENIM
Appears in Collections:(CENIM) Cursos-Material didáctico
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