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Synthesis and Microstructural Characterization of Substoichiometric Ti 2 Al(C x N y ) Solid Solutions and Related Ti 2 AlC x and Ti 2 AlN End‐Members
Author(s) -
Yu Wenbo,
GauthierBrunet Véronique,
Cabioc'h Thierry,
Dubois Sylvain
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12930
Subject(s) - max phases , materials science , solid solution , carbide , nitride , hot isostatic pressing , microstructure , analytical chemistry (journal) , carbon fibers , hot pressing , crystallography , metallurgy , nanotechnology , composite material , composite number , chemistry , layer (electronics) , chromatography
Ti , TiC , Al and AlN powders were mixed to synthesize Ti 2 Al ( C x N y ) ( x + y < 1) solid solutions, Ti 2 AlC x ( x < 1) and Ti 2 AlN ‐related end‐members by hot isostatic pressing at 1400°C/80 MPa for 4 h. For the pure carbides, it is demonstrated that single‐phased samples can only be obtained when about 15% of substoichiometry on the carbon site is applied. Such a result likely implies that Ti 2 AlC x can only exist in a narrow range of carbon composition. Ti 2 AlN nitride can be synthesized with y = 1. Assuming that vacancy content varies linearly from 0 to 0.15 going from Ti 2 AlN to Ti 2 AlC 0.85 in the solid solutions, element concentrations have been calculated to synthesize different solid solutions. Thus, it is demonstrated that single‐phased and fully dense Ti 2 Al ( C 0.23 N 0.71 ), Ti 2 Al ( C 0.45 N 0.45 ), and Ti 2 Al ( C 0.66 N 0.22 ) carbonitrides can be synthesized.