Microstructure and compression properties of in situ dual phase nanosized (TiB 2 –Ti 5 Si 3 )/TiAl matrix composites fabricated by combustion synthesis and hot press consolidation

Abstract

The dual phase nanosized (TiB₂–Ti₅Si₃)/TiAl composites were successfully fabricated using in situ method of combustion synthesis and hot press consolidation. The effects of proportions of the in situ dual phase nanoparticles (TiB₂ and Ti₅Si₃) on microstructures and compression properties of the composites were investigated. Compared with the monophase TiB₂ and Ti₅Si₃ particles, dual phase TiB₂–Ti₅Si₃ particles exhibit more obvious grain refinement effect. The grain size of TiAl alloy was refined from ∼66 to ∼12 μm with the the generation of dual phase TiB₂–Ti₅Si₃ particles. Moreover, the TiAl matrix composites reinforced with dual phase nanosized TiB₂–Ti₅Si₃ particles exhibit better comprehensive compression properties. When TiB₂:Ti₅Si₃ = 2:1[Σ(TiB₂ + Ti₅Si₃) = 4 vol.-%], the TiAl matrix composite has a high true fraction strain of 26.1%, a true yield strength of 761 MPa and an ultimate compression strength of 1647 MPa.

Keywords

Dual phase Nanoparticles TiAl matrix composites

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