Abstract
A microstructure and age-hardening investigation was performed on a chromium nitride and tungsten nitride (CrWN) transition metal nitride coating for optical glass molds using electron microscopy and nano-indentation. The as-deposited coating had a non-uniformly distributed coherent solid solution matrix causing limited strengthening and unsatisfactory mechanical performance. Annealing of the coating induced spinodal decomposition of supersaturated solid solution and promoted diffusion within and homogenization of the solid solution matrix. Large areas of homogenized solid solution greatly strengthened the coherent matrix resulting in significant age-hardening of the annealed coating. These findings provide supporting data for understanding the age-hardening mechanism of transition metal nitride coatings.
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