The influence of CaO on alumina grain boundary mobility

Ruth Moshe; Wayne D. Kaplan

doi:https://doi.org/10.1016/j.jeurceramsoc.2018.10.014

The influence of CaO on alumina grain boundary mobility

Ruth Moshe, Wayne D. Kaplan

Technion - Israel Institute of Technology

Research output: Contribution to journal › Article › peer-review

Abstract

The influence of CaO on the evolving microstructure of alumina has been studied in a range of concentrations below the solubility limit. The amount of Ca in the alumina was determined by conducting fully standardized wavelength dispersive spectroscopy, and the change in grain boundary mobility as a function of the amount of dopant was characterized using scanning electron microscopy. Unlike segregating dopants which reduce grain boundary mobility by solute-drag, CaO increases the rate of grain growth, and a trend of increased mobility with increasing dopant level was shown. The increased mobility with Ca segregation is believed to be due to an increase in vacancy concentration in the vicinity of the grain boundaries, thus facilitating faster grain boundary motion.

Original language	American English
Pages (from-to)	1324-1328
Number of pages	5
Journal	Journal of the European Ceramic Society
Volume	39
Issue number	4
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2018.10.014
State	Published - 1 Apr 2019

Keywords

Alumina
Grain boundary mobility
Segregation
Solute-drag

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Materials Chemistry

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https://doi.org/10.1016/j.jeurceramsoc.2018.10.014

Cite this

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title = "The influence of CaO on alumina grain boundary mobility",

abstract = "The influence of CaO on the evolving microstructure of alumina has been studied in a range of concentrations below the solubility limit. The amount of Ca in the alumina was determined by conducting fully standardized wavelength dispersive spectroscopy, and the change in grain boundary mobility as a function of the amount of dopant was characterized using scanning electron microscopy. Unlike segregating dopants which reduce grain boundary mobility by solute-drag, CaO increases the rate of grain growth, and a trend of increased mobility with increasing dopant level was shown. The increased mobility with Ca segregation is believed to be due to an increase in vacancy concentration in the vicinity of the grain boundaries, thus facilitating faster grain boundary motion.",

keywords = "Alumina, Grain boundary mobility, Segregation, Solute-drag",

author = "Ruth Moshe and Kaplan, {Wayne D.}",

note = "Funding Information: The authors thank R. Marder, H. Nahor and L. Rudnik for helpful discussions, and A. Berner for assistance with the WDS analysis. This research was partially supported by the Israel Science Foundation (grant No. 1779/18 ) and the Karl Stoll Chair in Advanced Materials at the Technion . Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

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doi = "https://doi.org/10.1016/j.jeurceramsoc.2018.10.014",

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AU - Kaplan, Wayne D.

N1 - Funding Information: The authors thank R. Marder, H. Nahor and L. Rudnik for helpful discussions, and A. Berner for assistance with the WDS analysis. This research was partially supported by the Israel Science Foundation (grant No. 1779/18 ) and the Karl Stoll Chair in Advanced Materials at the Technion . Publisher Copyright: © 2018 Elsevier Ltd

PY - 2019/4/1

Y1 - 2019/4/1

N2 - The influence of CaO on the evolving microstructure of alumina has been studied in a range of concentrations below the solubility limit. The amount of Ca in the alumina was determined by conducting fully standardized wavelength dispersive spectroscopy, and the change in grain boundary mobility as a function of the amount of dopant was characterized using scanning electron microscopy. Unlike segregating dopants which reduce grain boundary mobility by solute-drag, CaO increases the rate of grain growth, and a trend of increased mobility with increasing dopant level was shown. The increased mobility with Ca segregation is believed to be due to an increase in vacancy concentration in the vicinity of the grain boundaries, thus facilitating faster grain boundary motion.

AB - The influence of CaO on the evolving microstructure of alumina has been studied in a range of concentrations below the solubility limit. The amount of Ca in the alumina was determined by conducting fully standardized wavelength dispersive spectroscopy, and the change in grain boundary mobility as a function of the amount of dopant was characterized using scanning electron microscopy. Unlike segregating dopants which reduce grain boundary mobility by solute-drag, CaO increases the rate of grain growth, and a trend of increased mobility with increasing dopant level was shown. The increased mobility with Ca segregation is believed to be due to an increase in vacancy concentration in the vicinity of the grain boundaries, thus facilitating faster grain boundary motion.

KW - Alumina

KW - Grain boundary mobility

KW - Segregation

KW - Solute-drag

UR - https://www.mendeley.com/catalogue/917dadb3-59c1-36d5-a220-4ff098509363/

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U2 - https://doi.org/10.1016/j.jeurceramsoc.2018.10.014

DO - https://doi.org/10.1016/j.jeurceramsoc.2018.10.014

M3 - Article

SN - 0955-2219

VL - 39

SP - 1324

EP - 1328

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 4

ER -

The influence of CaO on alumina grain boundary mobility

Abstract

Keywords

All Science Journal Classification (ASJC) codes

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