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(Color online) Calculated mixing free energy ΔG (a) and the local tendencies for the spinodal decomposition (b) in c-Ti z Cr y Al x N at 1300 K. The arrows represent the most favorable directions of spinodal decomposition. The lengths of the arrows are proportional to the magnitudes of the second derivatives, indicating the strength of the decomposition trends. The circles represent compositions with positive second derivatives in all directions.
(Color online) TEM analysis of Ti0.45Cr0.08Al0.47N coating. (a) Lattice resolved diffraction contrast bf TEM image of a region aligned along the 002 zone axis and corresponding selected area electron diffraction (SAED). (b) Predominant z contrast scanning-TEM image including 30 × 30 nm2 area (red square #1) scanned to record EDX map with 0.5 nm/pixel resolution. Overlaid color coded maps of Ti(red), Cr(blue), and Al(green) are shown in the insets. (c) The Ti, Cr, and Al signal extracted from a 20 nm EDX line profile (labeled 2 in image (b) recorded with 0.3 nm/pixel resolution.
(Color online) DSC results obtained from Ti0.31Cr0.07Al0.62N and Ti0.33Al0.67N showing the alleged hexagonal transformation peaks. The inset contains hardness results of Ti0.31Cr0.07Al0.62N in comparison to Ti0.33Al0.67N and Cr0.32Al0.68N. Samples were annealed at up to 1100 °C for 2 h.
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