The effective diffusion coefficient of a diffusant in atomic diffusion of solid polycrystalline materials like metal alloys is often represented as a weighted average of the grain boundary diffusion coefficient and the lattice diffusion coefficient. Diffusion along both the grain boundary and in the lattice may be modeled with an Arrhenius equation. The ratio of the grain boundary diffusion activation energy over the lattice diffusion activation energy is usually 0.4–0.6, so as temperature is lowered, the grain boundary diffusion component increases. Increasing temperature often allows for increased grain size, and the lattice diffusion component increases with increasing temperature, so often at 0.8 Tmelt (of an alloy), the grain boundary component can be neglected.
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| - Effective diffusion coefficient (en)
- Coeficiente de difusão efetivo (pt)
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| - The effective diffusion coefficient of a diffusant in atomic diffusion of solid polycrystalline materials like metal alloys is often represented as a weighted average of the grain boundary diffusion coefficient and the lattice diffusion coefficient. Diffusion along both the grain boundary and in the lattice may be modeled with an Arrhenius equation. The ratio of the grain boundary diffusion activation energy over the lattice diffusion activation energy is usually 0.4–0.6, so as temperature is lowered, the grain boundary diffusion component increases. Increasing temperature often allows for increased grain size, and the lattice diffusion component increases with increasing temperature, so often at 0.8 Tmelt (of an alloy), the grain boundary component can be neglected. (en)
- O coeficiente de difusão efetivo (também referido como o coeficiente de difusão aparente) de um difundente em difusão atômica de materiais sólidos policristalinos como ligas metálicas é muitas vezes representada como uma média ponderada do e o coeficiente de difusão de retículo. (pt)
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| - The effective diffusion coefficient of a diffusant in atomic diffusion of solid polycrystalline materials like metal alloys is often represented as a weighted average of the grain boundary diffusion coefficient and the lattice diffusion coefficient. Diffusion along both the grain boundary and in the lattice may be modeled with an Arrhenius equation. The ratio of the grain boundary diffusion activation energy over the lattice diffusion activation energy is usually 0.4–0.6, so as temperature is lowered, the grain boundary diffusion component increases. Increasing temperature often allows for increased grain size, and the lattice diffusion component increases with increasing temperature, so often at 0.8 Tmelt (of an alloy), the grain boundary component can be neglected. (en)
- O coeficiente de difusão efetivo (também referido como o coeficiente de difusão aparente) de um difundente em difusão atômica de materiais sólidos policristalinos como ligas metálicas é muitas vezes representada como uma média ponderada do e o coeficiente de difusão de retículo. Difusão ao longo tanto do contorno de grão como do retículo cristalino podem ser modelados com uma equação de Arrhenius. A razão da energia de ativação da difusão de contorno de grão sobre a energia de ativação da difusão de retículo é normalmente 0,4 - 0,6, assim que a temperatura é reduzida, o componente de difusão do contorno de grão aumenta. Aumentando-se a temperatura geralmente permite-se um aumento do tamanho de grão, e o componente da difusão por retículo aumenta com o aumento da temperatura, por isso muitas vezes a 0,8Tfusão (de uma liga), o componente do contorno de grão pode ser negligenciado. (pt)
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