Controlled Grain Growth

Brook, R. J.

doi:10.1016/b978-0-12-341809-8.50024-3

Cited by 203 publications

(103 citation statements)

References 10 publications

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“…In the context of Eq. 5, this requires that the mobility-driving force product be inversely proportional to <T. Several explanations have been proposed to account for the frequent occurrence of cubic grain growth kinetics in ceramics [16,17].…”

Section: Page 11mentioning

confidence: 99%

Anisotropy of Grain Growth in Alumina

Rödel

Glaeser

1990

Journal of the American Ceramic Society

113

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Grain growth in theoretically dense undoped and MgO‐doped polycrystalline Al2O3 was studied, and average grain‐boundary migration rates were compared with those of a‐plane and c‐plane sapphire during migration into the same undoped and MgO‐doped materials. The results are discussed in terms of a grain‐size‐dependent grain‐boundary mobility‐grain‐boundary energy product, Mbγb. The grainsize dependencies of the Mbγb products for seed and matrix grains differ. Seed orientation appears to affect the nature of solute‐boundary interactions. The importance of grain‐boundary structure on migration characteristics is also indicated by a demonstration of twin‐formation‐enhanced grain growth.

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Section: Page 11mentioning

confidence: 99%

Anisotropy of Grain Growth in Alumina

Rödel

Glaeser

1990

Journal of the American Ceramic Society

113

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“…[12][13][14][15] The static grain growth is phenomenologically analyzed by kinetics of grain size as a function of time. In the classical theory for grain growth, the grain size can be given as 16) is the grain growth exponent, and K is the growth constant. The reported data of the parameters are scattered, but in the case of normal grain growth in single-phase TZP, m ¼ 2 is often used for the phenomenological analysis.…”

Section: Introductionmentioning

confidence: 99%

Small Dopant Effect on Static Grain Growth and Flow Stress in Superplastic TZP

2003

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Static grain growth behavior in 1 mol% of GeO 2 , TiO 2 , MgO or BaO-doped ZrO 2 -3 mol%Y 2 O 3 (3Y-TZP) was examined at 1400 C with a special interest in dopant effect on superplastic flow stress in fine-grained 3Y-TZP. The static grain growth can be described as normal grain growth in single-phase ceramics, and growth constant K for each material is in the order of 10% flow stress of the superplastic flow. The value of K in cation-doped TZP is correlated well with dopant cation's ionic radius. Assuming activation energy for diffusivity of constituent ion can be given as a linear function of strain caused by difference in the ionic size of dopant cation, the dependence of the growth constant and the flow stress on the ionic radius can be described as a function of the ionic radius of the dopant cation. The activation energy for the diffusivity in cationdoped TZP estimated from the calculation is in good agreement with the experimental data. The small dopant effect on the superplastic flow stress is well described by the activation energy as the function of the dopant cation's ionic size.

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“…While our analysis of elongated pores is to our knowledge new, migration of lenticular pores controlled by diffusion through the pore-filling fluid has previously been addressed in classical studies on spherical pores (Shewmon 1964;Brook 1969Brook , 1976 and in an approximate analytical approach (Monchoux and Rabkin 2002). In our notation, the classical solutions for a spherical pore read…”

Section: Discussionmentioning

confidence: 99%

Characteristics of pore migration controlled by diffusion through the pore-filling fluid

Petrishcheva

Renner

2010

Phys Chem Minerals

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We analyze drag and drop of pores filled with a fluid phase, e.g., water or melt, in which the constituting elements of the solid matrix are dissolved. Assuming that the diffusion through the fluid-phase dominates bulk transport kinetics, we address the problem of pore motion and calculate the pore mobility and the critical velocity of elongated and lenticular pores on a grain boundary for arbitrary dihedral angle. The found variations in critical velocity and mobility with dihedral angle are modest for given volume of pores with the two considered geometries. For given pore size, however, the dependence on dihedral angle accounts for several orders of magnitude in pore mobility and critical velocity.

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Controlled Grain Growth

Cited by 203 publications

References 10 publications

Anisotropy of Grain Growth in Alumina

Anisotropy of Grain Growth in Alumina

Small Dopant Effect on Static Grain Growth and Flow Stress in Superplastic TZP

Characteristics of pore migration controlled by diffusion through the pore-filling fluid

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