Characterisation of lattice damage formation in tantalum irradiated at variable temperatures |
| |
Authors: | I. IPATOVA P.T. WADY S.M. SHUBEITA C. BARCELLINI A. IMPAGNATIELLO E. JIMENEZ‐MELERO |
| |
Affiliation: | 1. School of Materials, The University of Manchester, Manchester, U.K.;2. Dalton Cumbrian Facility, The University of Manchester, Moor Row, U.K. |
| |
Abstract: | The formation of radiation‐induced dislocation loops and voids in tantalum at 180(2), 345(3) and 590(5)°C was assessed by 3MeV proton irradiation experiments and subsequent damage characterisation using transmission electron microscopy. Voids formed at 345(3)°C and were arranged into a body centred cubic lattice at a damage level of 0.55 dpa. The low vacancy mobility at 180(2)°C impedes enough vacancy clustering and therefore the formation of voids visible by TEM. At 590(5)°C the Burgers vector of the interstitial‐type dislocation loops is a<100>, instead of the a/2 <111> Burgers vector characteristic of the loops at 180(2) and 345(3)°C. The lower mobility of a<100> loops hinders the formation of voids at 590(5)°C up to a damage level of 0.55 dpa. |
| |
Keywords: | Dislocation analysis electron microscopy nuclear materials radiation damage tantalum void formation |
|
|