Dynamic hardness and elastic modulus calculation of porous SiAlON ceramics using depth-sensing indentation technique
✍ Scribed by Osman Sahin; Orhan Uzun; Małgorzata Sopicka-Lizer; Hasan Gocmez; Uğur Kölemen
- Book ID
- 104022818
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 921 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0955-2219
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✦ Synopsis
Interest in characterizing the mechanical properties of porous materials at micro-/nanometer scales has increased due to recent development of micro-/nanosystems. Depth-sensing indentation (DSI) systems, also referred to as nanoindentation, are strong tools for performing indentation measurements. The load-displacement curves of SiAlON-based porous ceramics were measured under different peak load (200-1800 mN). The most commonly used Oliver-Pharr method was used to analyze the unloading segments of these curves. The experimental results revealed that the dynamic hardness (H d ) and reduced elastic modulus (E r ) exhibit peak-load dependence, i.e., indentation size effect (ISE). Such peak-load dependence requires calculation of the load-independent hardness (H LI ) and elastic modulus (E r ). The experimental hardness data were analyzed using Meyer's law, Hays-Kendall's model, the proportional specimen resistance (PSR) model, and the modified PSR (MPSR) model. As a result, the modified PSR model is found to be the most effective one for H d determination of these SiAlON ceramics.