Abstract
The Al3Zr-η′ core-shell particles were observed in the Al-12Zn-2.4Mg-1.1Cu-0.5Ni-0.2Zr alloy using high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED). Two types of Al3Zr particles appear in the Al matrix: one is a standalone Al3Zr particle that is coherent with the matrix, and the other is an as-core Al3Zr particle acting as a nucleation site of the η′ precipitates, resulting in a core-shell particle which is semi-coherent with the matrix. The shell is composed of η′ precipitates with four variants. The strain in the as-core Al3Zr is lower than that in the standalone Al3Zr, and a considerable amount of strain exists across the interfacial regions between the η′ precipitates and the matrix.
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