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Nano-scale eutectics, such as rapid solidified Al-Si, exhibit enhanced yieldstrength and strain hardening but plasticity is limited by cracking of the hardphase (Si). Mechanisms that may suppress cracking and enable plasticco-deformation of soft and hard phases are key to maximizing plasticity inthese high-strength microstructures. Using a combination of laser rapidsolidification and chemical (Sr) modification, we have synthesized fullyeutectic Al-Si microstructures with heavily twinned Si nano-fibers that exhibithigh hardness up to 2.9 GPa, and high compressive flow strength (~840 MPa) withstable plastic flow to ~26% plastic strain. After deformation, the hard Si(Sr)fibers did not exhibit cracks, but a high density of stacking faults wereobserved in the Si(Sr) fibers suggesting partial dislocation mediatedplasticity. Mechanisms for suppression of cracking and activation of partialdislocations in Si deformed at room temperature are discussed in terms ofnanoscale fiber geometry with reduced aspect ratio and lowering of the Peierlsbarrier in chemically-modified, nano-twinned Si fibers.

materials science and engineering. a, structural materials: proporties, microstructures and processing/materials science and engineering. a, structural materials: properties, microstructure and processing

Enabling plastic co-deformation of disparate phases in a laser rapid  solidified Sr-modified Al-Si eutectic through  partial-dislocation-mediated-plasticity in Si