Projects per year
Transmission electron microscopy (TEM) of ex-situ He ion irradiated bulk W has been performed to quantitatively compare the damage microstructure to that observed in regions of comparable thicknesses during in-situ ion irradiation with TEM experiments. Samples were irradiated to achieve He-appm/DPA ratios of 2000 and 500 at temperatures of 500 and 800 °C to 1.5 and 3.0 DPA. For irradiations at 500 °C, bubble diameters (∼2 nm) were larger and areal bubble densities (∼1012 bubbles/cm2) were lower than those in the in-situ experiments. This is attributed to greater amounts of He being retained in the ex-situ bulk experiments whereas in the in-situ experiments some may escape due to the proximity of surfaces. Dislocation loops were observed in all samples and were characterised as b = ±½<111> type with no b = <100> type loops. Dislocation loop populations were dominated by interstitial type (∼60%) agreeing with in-situ experiments. However, dislocation loops in this work were larger, ranging in size from 7 to 100 nm and large concentrations of entangled dislocation lines were observed in the bulk of the grain as compared to in the in-situ experiments.
|Number of pages||7|
|Journal||Fusion Engineering and Design|
|Early online date||28 Nov 2018|
|Publication status||Published - 1 Jan 2019|
FingerprintDive into the research topics of 'Characterisation of helium ion irradiated bulk tungsten: A comparison with the in-situ TEM technique'. Together they form a unique fingerprint.
- 1 Finished
A Study of the Combined Effects of Displacement Damage and Helium Accumulation in Model Nuclear Materials
1/02/15 → 31/08/18