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Al-based composites reinforced with Mg–7.4%Al mechanically

alloyed particles have been synthesized by hot pressing followed

by hot extrusion. Microstructural characterization of the bulk

samples reveals the phase transformation of the reinforced particles

(Mg(Al)_ss + γ-Al₁₂Mg₁₇) to the stable intermetallic β-Al₃Mg₂ phase

which occurs during consolidation. The phase transformation leads

to the increase of effective volume faction of the reinforcement along

with strong interfacial bonding, which causes a significant increase

of the strength of the composites retaining appreciable plastic

deformation. The strengthening can be attributed to the reduction

of ligament size and to the interface strengthening due to better

interface bonding (load-transfer) between the Al-matrix and the

reinforcing particles.

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