In Situ Decomposition of Silicon Nitride Particles in Titanium Composite and its Mechanical Properties

Hisashi Imai; Hiroyasu Yamabe; Katsuyoshi Kondoh; Junko Umeda; Anak Khantachawana

doi:10.4028/www.scientific.net/KEM.737.38

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 737In Situ Decomposition of Silicon Nitride Particles...

In Situ Decomposition of Silicon Nitride Particles in Titanium Composite and its Mechanical Properties

Abstract:

Dependence of the mechanical properties of PM extruded titanium with the silicon nitride (Si₃N₄) on solid phase decomposition of Si₃N₄ was investigated. Si₃N₄ particles within Ti composite powder were decomposed during spark plasma sintering at 1223 K with 30 MPa pressure for 3.6 ks; and then, decomposition by-products of nitrogen and silicon atoms were defused into titanium matrix. The extruded Ti-1.0 mass% Si₃N₄ composite showed ultimate tensile strength (UTS) of 1139 MPa, and yield stress (0.2%YS) of 1065 MPa. UTS and 0.2%YS of P/M extruded Ti-1.0 mass% Si₃N₄ composite were 2 and 2.5 times compared to extruded pure Ti powder material, respectively. It was considered that the solid solution strengthening of both nitrogen and silicon originated from Si₃N₄ caused the high strength of PM extruded Ti-1.0 mass% Si₃N₄ composite.

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Periodical:

Key Engineering Materials (Volume 737)

Pages:

38-43

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.737.38

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Online since:

June 2017

Authors:

Hisashi Imai*, Hiroyasu Yamabe, Katsuyoshi Kondoh, Junko Umeda, Anak Khantachawana

Keywords:

Si₃N₄, PM Extruded Titanium, Solid Phase Decomposition, Solid Solution Strengthening

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References

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