Nanometric Cr-Al multilayer films are deposited by magnetron sputtering to investigate the influences of composition and annealing on the microstructure, phase transformation, and hardness. The enhancement of hardness of as-deposited coatings is attributed to solid solution strengthening and grain size strengthening. For the Crlcoatings with x= 30at.% and x=62 at.%, respectively, the annealing process prompts the formation of Crl and Crlintermetallic compounds. The enhancement of hardness of annealed coatings is primarily caused by the intermetallic formation and secondarily by oxide layer formation.
All Science Journal Classification (ASJC) codes
- Mechanical Engineering