Compressive performance and crack propagation in Al alloy/Ti2AlC composites
D.A.H.Hanaor, L.Hu, W.H.Kan, G.Proust, M.Foley, I.Karaman, M.Radovic
TL;DR
This study investigates the compressive behavior and crack propagation mechanisms in Al alloy/Ti2AlC composites with different pore structures, revealing that microstructure influences strength and failure modes, guiding improved composite design.
Contribution
It introduces a fabrication method for porous Ti2AlC/Al alloy composites and analyzes how pore size affects mechanical performance and crack propagation.
Findings
Fine structured composites have the highest compressive strength.
Crack propagation varies with microstructure, with shear cracks in fine structures.
Coarser structures show crack networks along phase interfaces.
Abstract
Composite materials comprising a porous Ti2AlC matrix and Al 6061 alloy were fabricated by a current-activated pressure assisted melt infiltration process. Coarse, medium and fine meso-structures were prepared with Al alloy filled pores of differing sizes. Materials were subjected to uniaxial compressive loading up to stresses of 668 MPa, leading to the failure of specimens through crack propagation in both phases. As-fabricated and post-failure specimens were analysed by X-ray microscopy and electron microscopy. Quasi-static mechanical testing results revealed that compressive strength was the highest in the fine structured composite materials. While the coarse structured specimens exhibited a compressive strength of 80% relative to this. Reconstructed micro-scale X-ray tomography data revealed different crack propagation mechanisms. Large planar shear cracks propagated throughout the…
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