In-situ Fabrication Technique of Al-matrix Composites Reinforced with Single or Hybrid Particles
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Abstract
Taken the composites of TiB2/Al and TiB2+Mg2Si/Al Al-matrix as examples in this paper, the in-situ fabrication techniques of Al-matrix composites reinforced with single or hybrid particles and the advantages of hybrid reinforcement are investigated. The salt-metal reaction route and melting process were combined to fabricate 5vol% TiB2+10% Mg2Si/Al composites successfully. Microstructure analysis and performance testing were carried out, and the results showed that, the TiB2 particles can act as good heterogeneous nucleation site for Mg2Si phase, which leads to the refinement and uniform distribution of Mg2Si. The Mg2Si eutectic phase is refined from over 50 μm to under 10 μm. TiB2 particles gathered along the grain boundary are broken up by Mg2Si phase, and TiB2 particles are uniformly distributed. The mutual refinement of TiB2 particles and Mg2Si phase is discovered. Compared with TiB2/Al composite, the yield stress and ultimate tensile strength of TiB2+Mg2Si/Al composite are improved by 88% and 45%, respectively.
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