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Inoculating Solid-state Homogeneous Precipitation by Impurity Atoms Through a Spinodal Decomposition Like Pathway by Pan, Shiwei; Li, Chunan; Søreide, Hanne-Sofie; Zhao, Dongdong; Hatzoglou, Constantinos; Qian, Feng; Chen, Long-Qing; Li, Yanjun is a scholarly article available to read on EtoBox.

What is Inoculating Solid-state Homogeneous Precipitation by Impurity Atoms Through a Spinodal Decomposition Like Pathway about?

Solid-state homogeneous precipitation of nano-sized precipitates is one of the most effective processes to strengthen metal alloys, where the final density and size distribution of precipitates are largely controlled by the precipitation kinetics. Here, we report a strategy to inoculate the homogeneous precipitation of coherent precipitates to enhance the precipitation strengthening. Using the technologically important dilute Al-Zr alloys as an example, we demonstrate that an addition of a trace level of economical and readily available, non-L1$_{2}$ phase forming impurity atoms, X (X= Sn, Sb, Bi or Cd) and Si, can significantly enhance the diffusivity of Zr atoms and overturn the precipitation of L1$_{2}$-structured Al$_{3}$Zr nanoparticles from the classical homogeneous nucleation and growth pathway into a nonclassical nucleation pathway: Al$_{3}$Zr forms through the spontaneous formation of nano-scale local concentration fluctuations of Zr atoms on Zr-X(-Si)-vacancy clusters followed by a continuous increase of the concentration and chemical short-range ordering (CSRO). Such an impurity atoms induced heterogeneous nucleation based on a "spinodal decomposition like" mechanism dra

Author

Pan, Shiwei; Li, Chunan; Søreide, Hanne-Sofie; Zhao, Dongdong; Hatzoglou, Constantinos; Qian, Feng; Chen, Long-Qing; Li, Yanjun

Published

2024

Language

EN