| Journal: | Materials research |
| Database: | PERIÓDICA |
| System number: | 000312894 |
| ISSN: | 1516-1439 |
| Authors: | Souza, Gelson Biscaia de1 Foerster, Carlos Eugenio2 Silva, Silvio Luiz Rutz da Lepienski, Carlos Mauricio |
| Institutions: | 1Universidade Estadual de Maringa, Departamento de Ciencias, Maringa, Parana. Brasil 2Universidade Estadual de Ponta Grossa, Departamento de Fisica, Ponta Grossa, Parana. Brasil |
| Year: | 2006 |
| Season: | Abr-Jun |
| Volumen: | 9 |
| Number: | 2 |
| Pages: | 159-163 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Nota breve o noticia |
| Approach: | Experimental |
| English abstract | The nanoindentation technique allows the determination of mechanical properties at nanometric scale. Hardness (H) and elastic modulus (E) profiles are usually determined by using the Oliver-Pharr method from the load/unload curves. This approach is valid only for flat surfaces, or at least, when a very low degree of asperity is present (lower than 30 nm). The basic statement is the determination of the zero tip-surface contact point. If a rough surface is present, errors can occur in determining this contact point and, as a consequence, the surface hardness and elastic modulus profiles are drastically altered resulting in under evaluated values. Surfaces with different roughness were produced by controlled nitrogen glow discharge process on titanium. The changed nitriding parameters were different N2/H2 atmospheres and temperatures (600 °C-900 °C). The most correct H and E profiles were obtained by using the contact stiffness analysis method, proposed here, that overcomes the surface roughness. The obtained results were compared with available literature data |
| Disciplines: | Ingeniería, Física y astronomía |
| Keyword: | Ingeniería de materiales, Ingeniería mecánica, Mecánica, elasticidad y reología, Titanio, Nitruración, Nanoestructuras, Propiedades mecánicas, Dureza |
| Keyword: | Engineering, Physics and astronomy, Materials engineering, Mechanical engineering, Mechanics, elasticity and rheology, Titanium, Nitriding, Mechanical properties, Hardness |
| Full text: | Texto completo (Ver HTML) |
