Fig. 1: Microstructural characterization by SXRD and TEM in both alloys under different heat treatment conditions.
From: Comprehensive analysis of ordering in CoCrNi and CrNi2 alloys
SXRD of a CrNi2 and b CoCrNi under different thermal treatment conditions. Additional SXRD peaks are detected in CrNi2 after aging for 170 and 240 h (see the inset in a, which is plotted on a log scale), indicating the presence of the long-range ordered oI6 phase. Only disordered FCC peaks are detected in CoCrNi. The triangles mark the 2nd harmonic of the main FCC peaks; they appear due to a secondary, low-intensity radiation with twice the energy of the main radiation. TEM c BF and d DF images (from circled reflections in e and f SAED patterns from the CrNi2 alloy aged for 240 h. Additional spots from the long-range ordered oI6 phase (red circles) are seen amidst the primary FCC spots. g BF-TEM image of a grain boundary of the CoCrNi sample showing the absence of coarser particles. h and i SAED of the CoCrNi alloy after aging for 240 h. No additional spots were detected beyond the disordered FCC phase. To mitigate dynamic scattering effects, all patterns were acquired using precession angles of 0.5°.
