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HomeMaterials Science ForumMaterials Science Forum Vol. 907TTT-Diagram of Intermetallic Phases Formation in...

TTT-Diagram of Intermetallic Phases Formation in Heat-Resistant Titanium Alloys

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Abstract:

The silicides and aluminides particles precipitation in near α-and two-phase (α + β) titanium – alloys has been investigated. It is shown that in Ti-Al-Si-Zr alloys three different types of particles are precipitated: (Ti,Zr)₅Si₃ (S₁), (Ti,Zr)₆Si₃ (S₂), (Ti,Zr)₂Si (S₃). The types of precipitated particles depend on the heat treatment modes and an alloying elements ratio. The investigation of silicide particles influence on the mechanical properties of the alloys has shown that silicides S₁ reduced viscosity characteristics. While silicides S₂ and S₃ were found to reduce the heat resistance due to the depletion of solid solution by Al and Si and to impede the formation of α₂ - phase particles. Microstructural investigation has been performed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The orientation relationships between silicides and matrix phase were identified by electron diffraction. Based on obtained results the schematic TTT-diagram of intermetallic phases formation has been suggested.

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Advanced Technologies of Materials Processing II

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Periodical:

Materials Science Forum (Volume 907)

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67-73

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https://doi.org/10.4028/www.scientific.net/MSF.907.67

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Online since:

September 2017

Authors:

Maria A. Popova*, A.A. Popov

Keywords:

Heat-Resistant Titanium Alloys, Intermetallic Phases, Properties, Silicide Particles, Structure

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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