Microstructure and compression properties of in situ dual phase nanosized (TiB2–Ti5Si3)/TiAl matrix composites fabricated by combustion synthesis and hot press consolidation. (July 2015)

• Record Type: Journal Article
• Authors: Qiu, F.; He, Y.; Zhu, L.; Shu, S. L.; Hu, W.; Zhan, C. H.; Jiang, Q. C.
• Is Part Of: Powder metallurgy. Volume 58:Number 3(2015)
• Page Start: 235
• Page End: 240
• Publication Date: 2015-07
• Subjects: Powder metallurgy -- Periodicals; 671.3705
• DOI: 10.1179/1743290115Y.0000000010
• Languages: German
• ISSNs: 0032-5899

Abstract

<abstract> <title> <x content-type="archive" xml:space="preserve">Abstract</x> </title> <p>The dual phase nanosized (TiB₂–Ti₅Si₃)/TiAl composites were successfully fabricated using <italic>in situ</italic> method of combustion synthesis and hot press consolidation. The effects of proportions of the <italic>in situ</italic> 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.</p> </abstract>