Characterisation of lattice damage formation in tantalum irradiated at variable temperatures

Journal of Microscopy
I IpatovaE Jimenez-Melero

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.

References

Mar 5, 2008·Journal of Electron Microscopy·Z YaoM A Kirk
Jul 16, 2013·Physical Review Letters·Haixuan XuDmitry Terentyev
Dec 23, 2016·Scientific Reports·T J NovakowskiA Hassanein

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