The Effect of Heat Treatment on Morphology and Phase Composition of Grain Boundary Phases in Mg-Zn-Y-Nd-Zr

Abstract:

The Mg-Zn-Y system attracts interest of researchers due to the formation of quasicrystalline particles which are believed to improve mechanical properties of Mg-based alloys. In the Mg-Zn-Y-Nd-Zr alloy (WE43 modified by addition of Zn) studied here the formation of icosahedral phase (I-phase) with quasicrystalline structure competes with cubic W-phase. Grain boundary phases in Mg-Zn-Y-Nd-Zr alloys subjected to various heat treatments were characterized. It was found that the portion of the I-phase in Mg-Zn-Y-Nd-Zr alloy can be increased by a suitable heat treatment. Moreover, the solidification process is influenced by the cooling rate resulting in a striking difference in the morphology of grain boundary phases.

• Periodical: Defect and Diffusion Forum (Volume 365)
• Pages: 30-35
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.365.30
• Online since: July 2015
• Authors: Oksana Melikhova*, Jakub Čížek, Marián Vlček, František Lukáč, Martin Vlach, Bohumil Smola, Ivana Stulíková, Radomír Kužel, Ivan Procházka, Hana Kudrnová, Aleš Jäger
• Keywords: Differential Scanning Calorimetry (DSC), Magnesium Alloys, Quasicrystals, Scanning Electron Microscopy (SEM)

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