| Journal: | Materials research |
| Database: | PERIÓDICA |
| System number: | 000312949 |
| ISSN: | 1516-1439 |
| Authors: | Florencio, Odila1 Silva-Junior, Paulo Sergio da Stefanini, Thais Franca Grandini, Carlos Roberto2 |
| Institutions: | 1Universidade Federal de Sao Carlos, Centro de Ciencias Exatas e de Tecnologia, Sao Carlos, Sao Paulo. Brasil 2Universidade Estadual Paulista "Julio de Mesquita Filho", Faculdade de Ciencias, Bauru, Sao Paulo. Brasil |
| Year: | 2006 |
| Season: | Oct-Dic |
| Volumen: | 9 |
| Number: | 4 |
| Pages: | 431-434 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Nota breve o noticia |
| Approach: | Experimental |
| English abstract | Mechanical spectroscopy measurements have been extensively used in the last decades to obtain information about many aspects of the behavior of solutes in metallic materials. Metals of body-centered cubic lattice that contain heavy interstitial elements (oxygen, nitrogen and carbon) in solid solution, present anelastic relaxation peaks when submitted to cyclic tensions, due to process know stress-induced ordering. Internal friction and frequency as a function of temperature were performed between 300 K and 650 K in a polycrystalline sample of Nb, for three distinct conditions, using a torsion pendulum inverted Kê-type operating in a frequency oscillation between 1Hz and 10 Hz range, with a heating rate of 1 K/min and pressure lower than 2 x 10-5 mbar. The experimental spectra obtained for each condition of the sample, were decomposed by the successive subtraction method in elementary Debye peaks. The following metal-interstitial interactions were identified: Nb-O and Nb-N for all conditions of the sample. From the anelastic relaxation parameters obtained (relaxation strength, peak temperature, activation energy and relaxation time) and lattice parameter (obtained from x ray diffraction), the determination of the oxygen and nitrogen interstitial diffusion coefficient in Nb was possible, for each condition of the sample |
| Disciplines: | Ingeniería, Física y astronomía |
| Keyword: | Ingeniería de materiales, Ingeniería metalúrgica, Física atómica y molecular, Fricción, Tensión, Propiedades mecánicas, Espectroscopía |
| Keyword: | Engineering, Physics and astronomy, Materials engineering, Metallurgical engineering, Atomic and molecular physics, Friction, Tension, Mechanical properties, Spectroscopy |
| Full text: | Texto completo (Ver HTML) |
