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Heat treatment of arc-evaporated cubic Al 0.7 Cr 0.3 N hard coatings in Ar up to 1450°C causes precipitation of AlN. The Cr-enriched matrix transforms into Cr via Cr 2 N under N 2 release. These reactions are investigated by simultaneous thermal analysis, mass spectrometry, X-ray diffraction, and analytical transmission electron microscopy.
This study demonstrates that plasma assisted chemical vapor deposited TiBN films, containing 17.4at.% B, show a supersaturated NaCl-structured solid solution where B substitutes N. During annealing, hexagonal close-packed TiB 2 precipitates form across B-rich domains, causing an increase in hardness at elevated temperatures. The findings are corroborated by ab initio calculations and additional...
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