Arunkumar, J. ; Abhaya, S. ; Rajaraman, R. ; Amarendra, G. ; Nair, K. G. M. ; Sundar, C. S. ; Baldev Raj, (2009) Defect recovery in proton irradiated Ti-modified stainless steel probed by positron annihilation Journal of Nuclear Materials, 384 (3). pp. 245-248. ISSN 0022-3115
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00223...
Related URL: http://dx.doi.org/10.1016/j.jnucmat.2008.11.014
Abstract
The defect recovery in proton irradiated Ti-modified D9 steel has been studied by positron annihilation isochronal and isothermal annealing measurements. D9 samples have been irradiated with 3 MeV protons followed by isochronal annealing at various temperatures in the range of 323 to 1273 K. The dramatic decrease in positron annihilation parameters, viz. positron lifetime and Doppler S-parameter, around 500 K indicates the recovery of vacancy-defects. A clear difference in the recovery beyond 700 K is observed between solution annealed and cold worked state of D9 steel due to the precipitation of TiC in the latter. Isothermal annealing studies have been carried out at the temperature wherein vacancies distinctly migrate. Assuming a singly activated process for defect annealing, the effective activation energy for vacancy migration is estimated to be 1.13 ± 0.08 eV.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 40274 |
| Deposited On: | 23 May 2011 10:45 |
| Last Modified: | 23 May 2011 10:45 |
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