Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/xmlui/handle/100/18119
Title: 'Age-hardened alloy' based on bulk polycrystalline oxide ceramic
Authors: GURNANI, L
SINGH, MK
BHARGAVA, P
MUKHOPADHYAY, A
Keywords: Free Precipitation Particles
Solid-State Precipitation
Strengthening Mechanisms
Fracture-Toughness
Magnesium Oxide
Single Crystals
Nanocomposites
Mgo
Microstructure
Dislocations
Issue Date: 2015
Publisher: TAYLOR & FRANCIS LTD
Citation: PHILOSOPHICAL MAGAZINE LETTERS, 95(5)285-294
Abstract: 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.
URI: http://dx.doi.org/10.1080/09500839.2015.1052858
http://dspace.library.iitb.ac.in/jspui/handle/100/18119
ISSN: 0950-0839
1362-3036
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