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Revisiting Precipitation kinetics in Mg-Zn alloy – a multi-characterization and modeling study
journal contributionposted on 2023-10-20, 02:29 authored by Y Yang, V Massardier, MRG Ferdowsi, Lu JiangLu Jiang, Jun WangJun Wang, Thomas DorinThomas Dorin, Sitarama KadaSitarama Kada, Matthew BarnettMatthew Barnett, M Perez
This work aims to provide new insights into understanding precipitation kinetics in Mg-Zn alloys. First, the evolution of Zn solute, precipitate size and volume fraction is characterized using a combination of thermoelectric power, X-ray diffraction, atom probe tomography and transmission-electron microscopy in an Mg-1.7at.%Zn alloy when aged at 150 °C and 200 °C. The experimental results are then supported by a precipitation model based on classical nucleation and growth theories for rod and plate-shaped precipitates. It is found that rod-shaped precipitates are prevalent in the early aging stage, while plate-shaped precipitates dominate the over-aging stage. The kinetics of both precipitates are depicted in detail to represent this competition. Finally, a time-temperature-transformation diagram for these two types of precipitates is proposed for this system.