Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/92721
Title: Indentation fracture toughness of high purity submicron alumina
Authors: Muchtar, A.
Lim, L.C. 
Issue Date: 2-Mar-1998
Citation: Muchtar, A.,Lim, L.C. (1998-03-02). Indentation fracture toughness of high purity submicron alumina. Acta Materialia 46 (5) : 1683-1690. ScholarBank@NUS Repository.
Abstract: High purity (99.99%) fine-grained alumina samples were prepared by colloidal techniques and sintered at temperatures varying from 1310 to 1550°C, yielding a final grain size ranging between 0.5 and 4.5 μm. Fracture toughness, KIC of the fine-grained alumina so prepared was determined by means of indentation test method. The KIC was found to increase with decreasing grain size. Scanning electron microscopy showed that the fracture mode in the submicron-grained samples was intergranular throughout whereas the coarser-grained samples displayed a mixture of inter- and trans-granular fracture mode. It is concluded that for brittle solids that fracture by cleavage, a way to improve its toughness is to decrease the grain size sufficiently to effect intergranular fracture. In the present study, a 25% increase in fracture toughness was obtained by such a technique. © 1998 Acta Metallurgica Inc.
Source Title: Acta Materialia
URI: http://scholarbank.nus.edu.sg/handle/10635/92721
ISSN: 13596454
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

27
checked on Oct 12, 2018

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.