Abstract
In this work, a cast Al3Zr/Al–2Li composite was fabricated using the in-situ method, which shows improvements of ∼32 % in strength and ∼12 % in stiffness compared with the Al–2Li matrix alloy. The refined grains, microscale D023-Al3Zr particles, nanoscale Al3(Zr, Li) phases, finer Al3Li precipitates, and narrowed Al3Li precipitate-free zones (PFZ) were observed in the composite. The interface between the reinforcement and matrix is well-combined. It was indicated that Orowan strengthening of Al3(Zr, Li) and coefficient of thermal expansion (CTE) mismatch strengthening of D023-Al3Zr were two main strengthening contributors. The fracture of the composite was transformed from intergranular to transgranular mode due to the narrowed PFZ and the stress concentration effect of Al3Zr.
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