Recrystallization Texture Competition Mediated by Segregation Element in Body-Centered Cubic Metals
Recrystallization texture is determined by the competition among various texture compo-nents during nucleation and grain growth.The stored energy and orientation gradient depend on the grain orientation in the deformed microstructure.Texture components,nucleating at positions with high stored energy and a sharp orientation gradient have kinetic advantages,can consume the nucleation sites and potential growth space of recrystallized grains in adjacent deformed grains.Segregation ele-ments can hinder nucleation and growth of recrystallization grains by reducing grain boundary mobility,and thus prevent texture components with kinetic advantages from invading adjacent deformed grains.It is valuable to provide a basis for precise recrystallization texture design and control by investigating the competitive relations among recrystallization texture components under the intervention of segregation elements.The recrystallization texture competition in a body-centered cubic Fe-3%Si alloy containing Sb was studied through experiment and simulation.It was found that the segregation element can weaken the γ(<111>//ND,ND—normal direction)and strengthen the α(<110>//RD,RD—rolling direction),as well as other recrystallization texture components with low stored energy,by inhibiting the invasion of γ-recrystallized grains into adjacent deformed grains.The two dominant factors for segregation effects are deformation texture and critical invasion radius.A quantitative model,based on nucleation and growth ki-netics,was proposed to explore the effect of critical invasion radius and deformation texture on recrystal-lization texture competition mediated by segregation elements.It was found that segregation elements can prolong the invasion incubation period and reduce the invasion rate to inhibit the consumption of α-deformed grains by γ-recrystallized grains.The inhibition effect initially strengthened and then weakened with the increasing γ deformation texture.
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