Berlin 2005 – wissenschaftliches Programm
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DS: Dünne Schichten
DS 23: Postersitzung I
DS 23.10: Poster
Freitag, 4. März 2005, 16:00–18:30, Poster TU B
New technique for mechanical characterization of coated and bulk materials — •Maksim Karniychuk1, Thomas Chudoba2, Volker Linss2 und Frank Richter1 — 1TU Chemnitz, Institut für Physik, 09107 Chemnitz, Germany — 2ASMEC Advanced Surface Mechanics GmbH, Bautzner Landstr. 45, 01454 Radeberg, Germany
Nanoindentation is one of the most important nondestructive methods for mechanical characterization of surfaces. During nanoindentation experiment only normal loads are applied. However, in practical cases both normal and lateral forces act together. Unfortunately, the results of scratch tests depend strongly on the conditions and a comparison is difficult. And nanoindentation alone cannot provide a comprehensive set of material parameters needed for simulation and optimization of protecting coatings. In order to overcome these problems a new Lateral Force Unit (LFU) was developed (ASMEC GmbH, Germany) and installed in a nanoindenter UMIS 2000 (CSIRO, Australia). The lateral force cycle is applied during the hold period of the normal maximum load. The first results of LFU test are the following: (1.) The LFU investigations allow the determination of the friction coefficient of the sample against diamond with high local resolution. (2.) The comparison of LFU and nanoindentation measurements allows the estimation of critical forces (lateral and normal) which lead to the onset of plastic deformation.