CrN hard films were deposited by using closed field unbalanced magnetron sputtering ion plating system(CFUBMIP).Ion bombardment energy during film deposition was changed by moderating bias voltage.The microstructrue,surface morphology and cross-sectional structure of various CrN films were investigated by XRD,AFM,and SEM.The mechanism of growth and preferred orientation of CrN hard films under different ion bombardment energy were studied.Results show that film consists of CrN single phase with columnar gro...