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Effect of He-appm/DPA ratio on the damage microstructure of tungsten

Published online by Cambridge University Press:  23 May 2016

R.W. Harrison ,
H. Amari ,
G. Greaves ,
J.A. Hinks  and
S.E. Donnelly
R.W. Harrison*
Affiliation:
School of Computing and Engineering, University of Huddersfield, Huddersfield, HD1 3DH
G. Greaves
Affiliation:
School of Computing and Engineering, University of Huddersfield, Huddersfield, HD1 3DH
J.A. Hinks
Affiliation:
School of Computing and Engineering, University of Huddersfield, Huddersfield, HD1 3DH
S.E. Donnelly
Affiliation:
School of Computing and Engineering, University of Huddersfield, Huddersfield, HD1 3DH
*
*(Email: [email protected])
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Abstract

In-situ ion irradiation and transmission electron microscopy has been used to examine the effects of the He appm to DPA ratio, temperature and dose on the damage structure of tungsten (W). Irradiations were performed with 15 or 60 keV He+ ions, achieving He-appm/displacements per atom (DPA) ratios of ∼40,000 and ∼2000, respectively, at temperatures between 500 and 1000°C to a dose of ∼3 DPA. A high number of small dislocation loops with sizes around 5–20 nm and a He bubble lattice were observed for both He-appm/DPA ratios at 500°C with a bubble size ∼1.5 nm. Using the g.b =0 criterion the loops were characterised as b = ±1/2<111> type. At 750°C bubbles do not form an ordered array and are larger in size compared to the irradiations at 500°C, with a diameter of ∼3 nm. Fewer dislocation loops were observed at this temperature and were also characterised to be b = ±1/2<111> type. At 1000°C, no dislocation loops were observed and bubbles grew as a function of fluence attributed to vacancy mobility being higher and vacancy clusters becoming mobile.

Keywords

transmission electron microscopy (TEM)radiation effectsnuclear materials
Type
Articles
Information
MRS Advances , Volume 1 , Issue 42: Energy and Environment , 2016 , pp. 2893 - 2899
Copyright
Copyright © Materials Research Society 2016 

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