Positron annihilation study of alloys for fission and fusion technology

Slugeň, V.; Kršjak, Vladimír; Petriska, Martin; Zeman, A.; Miklos, M.

doi:10.1002/pssc.200675799

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…The interested reader may look into review articles on this subject [31][32] and the references therein. A few references are cited at the end [33][34][35][36][37][38][39][40] .…”

Section: Discussionmentioning

confidence: 99%

Characterisation of Ion Implantation-induced Defects in Certain Technologically Important Materials by Positron Annihilation

Nambissan

2009

DSJ

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The application of positron annihilation spectroscopy for the studies of defects produced by different types of charged particles and ions in a variety of materials is discussed with specific examples. The ability to detect and quantify the information through the characteristic parameters of the annihilation radiation in a totally non-destructive method has made the fundamental process of electron-positron annihilation a powerful spectroscopic probe for investigating the structure and properties of materials. Ion implantation produces defects in the structure of solids and the latter can be recovered from the defects by annealing at high temperatures. Here the annealing is done in sequential steps so that the different stages of evolution of defects and their interaction with impurity atoms can be studied systematically. Defects produced by irradiation by particles like protons, alpha, boron and neon ions in materials ranging from simple metals to binary alloys are discussed. A detailed evaluation of the positron lifetimes in terms of the popular positron trapping models is also presented. Further as a special case, the method of extraction of values of several useful physical parameters of inert gas bubbles inside a metal matrix is explained with the help of a model analysis.

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“…The interested reader may look into review articles on this subject [31][32] and the references therein. A few references are cited at the end [33][34][35][36][37][38][39][40] .…”

Section: Discussionmentioning

confidence: 99%

Characterisation of Ion Implantation-induced Defects in Certain Technologically Important Materials by Positron Annihilation

Nambissan

2009

DSJ

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“…The positron annihilation lifetime spectroscopy (PALS) [5,6] can determine a concentration and a size of vacancy-type defects in samples with a very low concentration (from 0.1 to 500ppm) [6]; therefore it can describe the area where transmission electron microscopy (TEM) is not so sensitive. Positron lifetime can be linearly dependant on the defect size or a certain range of defect dimensions [7,8].…”

Section: Experimental Techniquementioning

confidence: 99%

Vacancy Type Defects in Oxide Dispersion Strengthened Steels

Slugeň

Veterníková

Degmová

et al. 2012

MSF

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This study was focused on commercial oxide-dispersion strengthened (ODS) steels - MA 956 (20%Cr), PM 2000 (19%Cr), ODM 751 (16%Cr) and MA 957 (14%Cr) developed for fuel cladding of GEN IV reactors. The ODS steels are described in order to comparison of their microstructure features. Vacancy defects were observed by Doppler Broadening Spectroscopy (DBS) and Positron Annihilation Lifetime Spectroscopy (PALS). Residual stress proportional to all kinds of defects was investigated by Magnetic Barkhausen Noise (MBN) measurement. The highest presence of open volume defects was found in MA 956 and the lowest defect concentration in MA 957, although this steel contains the largest defects (six-vacancies together with dislocations). Other investigated steels demonstrated probably three- or four-vacancy clusters. Further, results from positron technique indicated proportionality of chromium content to defect concentration. Magnetic Barkhausen noise results also showed that Hpeak value (describing grain size) increased with growth of chromium content. However residual stress was independent on chromium level.

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