| Abstract: | The tailored nanoparticles with a complex core/shell structure can satisfy a variety of demands,such as lattice misfit,shearability and coarsening resistance.In this research,core-shell nanoscale Al3(Yb,Er,Sc,Zr,Li)composite particles were precipitated in Al-2Li-0.1Yb-0.1Er-0.1Sc-0.1 Zr(wt％)alloy through the double-aging treatment,in which the core was(Yb,Er,Sc,Zr)-rich formed at 300℃ and the shell was Li-rich formed at 150℃.The coarsening kinetics and precipitate size distributions(PSDs) of Al3(Yb,Er,Sc,Zr,Li)particles aged at 150℃ previously aged at 300℃ for 24 h showed a better fit to the relation of 2α kt and normal distribution,indicating that the coarsening of precipitates was controlled by interface reaction not diffusion.The Orowan bypass strengthening was operative mechanism at 150℃. |
