Record Details

'Age-hardened alloy' based on bulk polycrystalline oxide ceramic

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title 'Age-hardened alloy' based on bulk polycrystalline oxide ceramic
 
Creator GURNANI, L
SINGH, MK
BHARGAVA, P
MUKHOPADHYAY, A
 
Subject FREE PRECIPITATION PARTICLES
SOLID-STATE PRECIPITATION
STRENGTHENING MECHANISMS
FRACTURE-TOUGHNESS
MAGNESIUM OXIDE
SINGLE CRYSTALS
NANOCOMPOSITES
MGO
MICROSTRUCTURE
DISLOCATIONS
microstructure
age-hardened polycrystalline ceramics
mechanical properties
heat treatment
 
Description We report here for the first time the development of 'age-hardened/toughened' ceramic alloy based on MgO in the bulk polycrystalline form. This route allows for the facile development of a 'near-ideal' microstructure characterized by the presence of nanosized and uniformly dispersed second-phase particles (MgFe2O4) within the matrix grains, as well as along the matrix grain boundaries, in a controlled manner. Furthermore, the intragranular second-phase particles are rendered coherent with the matrix (MgO). Development of such microstructural features for two-phase bulk polycrystalline ceramics is extremely challenging following the powder metallurgical route usually adopted for the development of bulk ceramic nanocomposites. Furthermore, unlike for the case of ceramic nanocomposites, the route adopted here does not necessitate the usage of nano-powder, pressure/electric field-assisted sintering techniques and inert/reducing atmosphere. The as-developed bulk polycrystalline MgO-MgFe2O4 alloys possess considerably improved hardness (by ~52%) and indentation toughness (by ~35%), as compared to phase pure MgO.
 
Publisher TAYLOR & FRANCIS LTD
 
Date 2016-01-15T08:03:48Z
2016-01-15T08:03:48Z
2015
 
Type Article
 
Identifier PHILOSOPHICAL MAGAZINE LETTERS, 95(5)285-294
0950-0839
1362-3036
http://dx.doi.org/10.1080/09500839.2015.1052858
http://dspace.library.iitb.ac.in/jspui/handle/100/18119
 
Language en