Quick matrix mode for grid indentation method
Grid indentation is a special nanoindentation technique for a wide range of multiphase materials. However, this method can be quite time consuming since it consists of performing many indentations. The Quick matrix mode, which has recently been developed by Anton Paar for the Nanoindentation (NHT3) and Ultra Nanoindenation Tester (UNHT3), allows for performing hundreds of indents in less than one hour while maintaining high precision of each nanoindentation measurement. The results of the Quick matrix mode can be directly analyzed by Gaussian fit to determine properties of each phase and a color mapping of mechanical properties can be obtained.
Many modern materials consist of several phases and it is often required to test the individual phases. Often however, the phases are relatively small and it could be very difficult to measure each phase by localized indentations. In such cases, a two-dimensional mapping of the surface (known also as grid indentation) can be used to extract the properties of individual phases by means of a statistical analysis. Apart from various metallic and ceramic multiphase materials, large indentation arrays (grid indentations) are also useful to study cement, concrete, heterogeneous microstructures or local anisotropy of small grains.
Several reasons make the grid indentation method more suitable for multiphase materials than the isolated indentation. Firstly, the location of the phases in the microscope for the isolated indentation can be very difficult or impossible due to low contrast.
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