Ilze Manika and Janis Maniks 2008 J. Phys. D: Appl. Phys. 41 074010 doi:10.1088/0022-3727/41/7/074010
Ilze Manika and Janis Maniks
Show affiliationsThe indentation depth limits for the Vickers microhardness testing of amorphous, polycrystalline, multilayer and single crystal coatings were investigated. The coating/substrate hardness ratio was varied in the range from 0.01 to 20. The critical indentation depth hc, below which the substrate has a negligible effect on the hardness, was estimated from the experimentally obtained hardness versus indentation depth curves. The results show a marked effect of the coating structure on the size of the influence zone beneath the indenter. The indentation depth limits were found to increase in the row of single crystal → polycrystalline → amorphous coatings. The obtained indentation depth criteria are compared with the reference data obtained by using finite element and kinematic calculations.
68.60.Bs Mechanical and acoustical properties
62.20.Qp Friction, tribology, and hardness
68.55.-a Thin film structure and morphology
62.25.-g Mechanical properties of nanoscale systems
81.40.Np Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure
Surfaces, interfaces and thin films
Issue 7 (7 April 2008)
Received 6 August 2007, in final form 8 November 2007
Published 12 March 2008
Ilze Manika and Janis Maniks 2008 J. Phys. D: Appl. Phys. 41 074010
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