Journal
JOURNAL OF MATERIALS RESEARCH
Volume 24, Issue 8, Pages 2483-2498Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/JMR.2009.0299
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- The Swedish Research Council (VR)
- Swedish Foundation for Strategic Research (SSF)
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(Ti1-xSix)N-y (0 <= x <= 0.20; 0.99 <= y(x) <= 1.13) thin films deposited by arc evaporation have been investigated by analytical transmission electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy, and nanoindentation. Films with x <= 0.09 are single-phase cubic (Ti,Si)N solid solutions with a dense columnar microstructure. Films with x > 0.09 haven a featherlike microstructure consisting of cubic TiN:Si nanocrystallite bundles separated by metastable SiNz with coherent-to-semicoherent interfaces and a dislocation density of as much as 10(14) cm(-2) is present. The films exhibit retained composition and hardness between 31 and 42 GPa in annealing experiments to 1000 degrees C due to segregation of SiN, to the grain boundaries. During annealing at 1100-1200 degrees C, this tissue phase thickens and transforms to amorphous SiNz. At the same time, Si and N diffuse out of the films via the grain boundaries and TiN recrystallize.
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