کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1450687 | 988742 | 2005 | 9 صفحه PDF | دانلود رایگان |
A columnar TiN film under contact loading fails by shear fracture along inter-columnar boundaries. To deconvolute inter-columnar fracture strength from load–displacement curves, nanoindentation experiments were carried out on columnar ∼1.4 μm thick TiN films deposited on steels of various hardness, using a Berkovich indenter. A model, which is developed based on the shear-fracture driven deformation of the coating, is applied to the load–displacement curves to obtain inter-columnar fracture strength. The correlation between the fracture strength, biaxial residual stress and substrate yield stress is outlined. The result suggests that the presence of a high compressive residual stress substantially improves the shear fracture strength of a columnar TiN film.
Journal: Acta Materialia - Volume 53, Issue 8, May 2005, Pages 2459–2467