TEM characterisation of heavy-ion irradiation damage in Fe-Cr alloys
<p>Heavy-ion radiation damage in pure Fe and Fe-Cr binary alloys has been studied in this work using Transmission Electron Microscopy (TEM). </p> <p>Specimens were irradiated in bulk with 2 MeV Fe<sup>+</sup> ions with irradiation temperatures ranging from 300-600 deg...
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| Μορφή: | Thesis |
| Γλώσσα: | English |
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2009
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| Περίληψη: | <p>Heavy-ion radiation damage in pure Fe and Fe-Cr binary alloys has been studied in this work using Transmission Electron Microscopy (TEM). </p>
<p>Specimens were irradiated in bulk with 2 MeV Fe<sup>+</sup> ions with irradiation temperatures ranging from 300-600 degree C. Several irradiation doses were achieved at each temperature up to a maximum dose of 3x10<sup>19</sup> ions m<sup>-2</sup>
(about 7 displacements per atom: dpa). A TEM specimen preparation technique has been developed to access the peak of the buried damage region. In most cases, the damage took the form of dislocation loops. The sizes of the loops were a function of both irradiation dose and temperature with maximum loop sizes up to about 100nm at 7 dpa. </p>
<p>Loops with Burgers vectors of type b = a<100> and b = a/2<111> were both observed in all specimens. In pure Fe, the proportion of the a<100> loops increased significantly at high temperatures (500 degree C). This trend is not so clear in Fe-Cr alloys. Several loop nature determinations using inside-outside technique suggest that all the large loops are interstitial type. The vacancies are believed to exist either as small dislocation loops (<5nm) or sub-microscopic voids.</p>
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