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Synthesis, Characterization, and Intrinsic Hardness of Layered Nanolaminate Ti 3 AlC 2 and Ti 3 Al 0.8 Sn 0.2 C 2 Solid Solution
Author(s) -
Bei G. P.,
GauthierBrunet V.,
Tromas C.,
Dubois S.
Publication year - 2012
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/j.1551-2916.2011.04846.x
Subject(s) - nanoindentation , materials science , intermetallic , crystallography , rietveld refinement , analytical chemistry (journal) , composite material , crystal structure , chemistry , alloy , chromatography
The HIP ing of Ti–Al–1.9TiC and Ti–Al–0.2Sn–1.8TiC reactant mixtures yields Ti 3 AlC 2 and Ti 3 Al 0.8 Sn 0.2 C 2 solid solutions, respectively. Rietveld refinement gives a = 3.0786 ± 0.0001 Å and c = 18.589 ± 0.001 Å lattice parameters for Ti 3 AlC 2 and a = 3.0837 ± 0.0001 Å and c = 18.621 ± 0.002 Å for Ti 3 Al 0.8 Sn 0.2 C 2 . Furthermore, about 2–3 vol% of Ti x Al y intermetallics is detected in Ti 3 Al 0.8 Sn 0.2 C 2 solid solution. The intrinsic hardness, measured by nanoindention tests, is 11.4 ± 0.7 GPa for Ti 3 AlC 2 and 10.2 ± 0.6 GPa for Ti 3 Al 0.8 Sn 0.2 C 2 . Furthermore, hardness values, measured by microindentation tests, are compared with the ones measured by nanoindentation. It is shown that microindentation and nanoindentation performed with large loads lead to underestimated hardness values as several grains are involved in the deformation process. Finally, Y oung's modulus of Ti 3 AlC 2 and Ti 3 Al 0.8 Sn 0.2 C 2 is 260 ± 10 and 250 ± 10 GPa, respectively.