Novel reduced-activation TiVCrFe based high entropy alloys

The conditions inside next-generation nuclear reactors are likely to be extreme. High-performance materials will required, and there is still great scope for developing new improved alloys. High-entropy alloys (HEAs) potential candidates, it that such need based around low-activation elements tend form body-centred cubic structures. Whilst have been a number of investigations assessing the capability CALPHAD databases predict phases formed in face-centred HEAs, their applicability less studied systems not well known. Here, two HEAs produced; TiVCrMnFe Si0.1TiVCr0.5Fe, microstructures assessed compared predictions. both comprised C14 Laves phase B2 following casting, BCC solid solution (A2) holding at 1200 °C, with high proportions constituent found each case. It was experimentally were quaternary intermetallics Fe, V, Cr Ti, V disordered across Fe site. These observations predictions made using four databases. accuracy varied markedly between underpredicted, often severely, by did account quinary nature phase. Removing Ti from resulted an equiatomic VCrMnFe alloy single °C.