Modeling of Diffusion Saturation of (α + β) Titanium Alloys by Nitrogen in the Rarefied Medium

Ya. Matychak; V. Fedirko; I. Pohreljuk; O. Yaskiv; O. Tkachuk

doi:10.4028/www.scientific.net/DDF.277.33

Paper Titles

Silicide Formation Reactions in a-Si/Co Multilayered Samples
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Lateral Diffusion Spreading of Two Competitive Intermetallic Phases over Free Surface
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Theoretical Analysis and Atomistic Modelling of Diffusion and Stability of Pure Element Hollow Nanospheres and Nanotubes
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Effect of Substrate Temperature on the Different Diffuseness of Subsequent Interfaces in Binary Multilayers
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Modeling of Diffusion Saturation of (α + β) Titanium Alloys by Nitrogen in the Rarefied Medium
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Suppression Criterion of the Phase Growth Based on Extremal Principles of Nonequilibrium Thermodynamics
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Model of Lateral Growth Stage during Reactive Phase Formation
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Coupling of Electromigration and Non-Equilibrium Vacancies in Reactive Phase Growth
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Mechano-Chemistry; Interdiffusion in Solid Solutions
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Modeling of Diffusion Saturation of (α + β) Titanium Alloys by Nitrogen in the Rarefied Medium

Abstract:

The diffusion saturation of (α + β) titanium alloy by nitrogen under rarefied medium taking into account the peculiarities of interaction both at the interface and in the metal core is modeled. The corresponding diffusion problem using the diffusion equations in the medium consisting two families of diffusion paths and non-stationary boundary condition at interface is analytically solved. The effect of the temperature and time parameters, volumetric quantity of β- phase on the kinetics of nitriding is estimated. It is established that with the increase of isothermal exposure temperature and quantity of β-phase the surface saturation by nitrogen decreases. It is caused by more intensive nitrogen penetration into bulk and formation of a deeper diffusion zone.