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Elastic moduli of grain boundaries in nanocrystalline MgO ceramics

Published online by Cambridge University Press:  01 March 2005

Ori Yeheskel ,
Rachman Chaim ,
Zhijian Shen  and
Mats Nygren
Ori Yeheskel
Affiliation:
Nuclear Research Center–Negev, Beer Sheva 84190, Israel
Rachman Chaim*
Affiliation:
Department of Materials Engineering, Technion–Israel Institute of Technology, Haifa 32000, Israel
Zhijian Shen
Affiliation:
Department of Inorganic Chemistry, BRIIE Center for Inorganic Interfacial Engineering, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
Mats Nygren
Affiliation:
Department of Inorganic Chemistry, BRIIE Center for Inorganic Interfacial Engineering, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
*
a)Address all correspondence to this author. e-mail: rchaim@technion.ac.il
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Abstract

Dense MgO ceramics with nanometer to submicrometer grain size were fabricated by high-temperature hot-isostatic pressing, low-temperature hot-pressing, and spark plasma sintering. The elastic properties were determined by sound wave velocity measurements. Young's and shear moduli of nanocrystalline MgO were lower by 13% than those with submicrometer grain size. Softening of the elastic properties was analyzed and related to the lower density and lower elastic moduli of the grain boundaries compared to the crystal interior. Young's and shear moduli of the grain boundaries were evaluated as 90 and 34 GPa, respectively. This leads to a more than 3-fold decrease in the effective elastic moduli with the decrease of grain size into the nanometer range.

Keywords

Elastic propertiesGrain boundariesNanoscale
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 3 , March 2005 , pp. 719 - 725
Copyright
Copyright © Materials Research Society 2005

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