Abstract

Microstructural and indentation-techniques mechanical investigations have been performed on a LaB6-TiB2 eutectic composite, obtained by the electric arc-melting in argon flow. Structure of solidified eutectics consists of directionally crystallized TiB2 fibers in LaB6 matrix. XRD, SEM and EDX analysis of eutectics were performed. The median diameter of the TiB2 fibers, calculated using statistical analysis of SEM micrographs, was 0.45 μm. The volume fraction of the TiB2 phase in eutectics was 16% as calculated by area fractions from SEM micrographs. The Vickers hardness (25.5 GPa) and fracture toughness (6.7 MPa ⋅m1/2) were measured on arc-melted LaB6-TiB2 alloy. Results were compared with the same ones, measured on floating-zone melted monocrystalline LaB6.

Details

Title
Structure, hardness and fracture toughness of arc-melted LaB6-TiB2 eutectic alloy
Author
Nesmelov, D D 1 ; Vikhman, S V 1 ; Novoselov, E S 1 ; Perevislov, S N 2 ; S S Ordan’yan 1 

 Saint-Petersburg State Institute of Technology, Saint-Petersburg, Russia 
 Institute of Silicate Chemistry of Russian Academy of Sciences, Saint Petersburg, Russia 
Publication year
2019
Publication date
Apr 2019
Publisher
IOP Publishing
ISSN
17578981
e-ISSN
1757899X
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2561025883
Copyright
© 2019. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.