Void swelling in ion irradiated (15Ni–14Cr), Ti-modified stainless steel: A study using positron annihilation and step height measurements
| Autor: | C. S. Sundar, G. Amarendra, S. Balaji, K.G.M. Nair, Balasubramanian Viswanathan, A.K. Balamurugan, S. Abhaya, B. K. Panigrahi, Baldev Raj, Christopher David |
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| Rok vydání: | 2009 |
| Předmět: |
Void (astronomy)
Materials science Ion beam Analytical chemistry chemistry.chemical_element Surfaces and Interfaces General Chemistry Condensed Matter Physics Surfaces Coatings and Films Ion Positron annihilation spectroscopy chemistry Materials Chemistry medicine Irradiation Atomic physics Swelling medicine.symptom Helium Positron annihilation |
| Zdroj: | Surface and Coatings Technology. 203:2363-2366 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2009.02.017 |
| Popis: | The void swelling behaviour of (15Ni–14Cr) Ti-modified steels simulated by heavy ion irradiation, has been investigated using step height measurements and positron annihilation spectroscopy. 18% cold-worked samples were pre-implanted with helium at 170 keV and 275 keV energies so as to create a uniform helium concentration of 100 appm around the 588 nm depth region. This was followed by a 2.5 MeV Ni ion irradiation to create a peak damage of ~ 84 dpa (displacement per atom) at various irradiation temperatures between 700 and 970 K. The gross swelling which has occurred throughout the ion range is determined by step height measurements. Defect-sensitive positron annihilation lineshape S-parameter measurements show clear changes consequently to void formation as a function of sample depth. From the variation of the average S-parameter as a function of irradiation temperature, the peak swelling temperature has been deduced. The changes observed in step height measurements are compared with positron annihilation measurements and the results are discussed. |
| Databáze: | OpenAIRE |
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