The sintering of two particles by surface and grain boundary diffusion—a two-dimensional numerical study
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Formation and evolution mechanisms of micropores in powder metallurgy Ti alloys
2022, Materials and DesignCitation Excerpt :It should be pointed out that micropores is a common issue for powder metallurgy materials, i.e., for Ti alloys [4,10], Fe alloys [11]and Al alloys [12], as the pressureless sintering is essentially a solid-state diffusion process. In the past decades, enormous effort has been made to understand the pores evolution in powder metallurgy materials and several models were proposed [4,13–17]. Zhu [14] & Wang [16] firstly applied a two-sphere model to describe the change of pores during sintering, and claimed that both the grains and the pores often increase in size while decreasing in quantity, of which the driving force originates from the reduction of the surface free energy of the material.
Rigid body motion of multiple particles in solid-state sintering
2022, Acta MaterialiaCitation Excerpt :This mechanism is coupled with surface diffusion; atoms flowing from the boundary to the neck are redistributed by surface diffusion [14,15]. Rigorous computer simulations have been conducted to study the sintering of two particles by this mechanism [14–21], providing the relationship between the rigid body motion and the thermodynamic driving force acting on a circular contact [12,17,21]. The particle velocity is described as a response to the driving force, i.e., the sintering force, and the mechanical forces arising from interaction among particles.
Three-dimensional virtual microstructure generation of porous polycrystalline ceramics
2019, Ceramics International