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Deformation and fracture behavior of niobium-10 at % vanadium alloy with hydrogen

Research paper by K. Jagannadham

Indexed on: 01 Dec '87Published on: 01 Dec '87Published in: Journal of Materials Science



Abstract

The results of e systematic study of deformation and fracture behaviour of niobium-10 at% vanadium alloy with or without o nominal 200 p.p.m. wt% hydrogen and deformed in tension are presented as function of orientation and two testing temperatures; 195 and 295 K. Single crystals, large and small grain size polycrystals are used to determine the mechanisms of hydrogen embrittlement. Metallographic observations using both optical and scanning electron microscopy of the surface features associated with deformation and fracture behaviour of this alloy containing hydrogen are illustrated. In particular, the relationship between slip, twinning and cracks is described Furthermore, the reasons for the relatively large ductility associated with niobium rich alloys in comparison with other Nb-V alloys are put forward. Discrete dislocation analysis of the models of twinning is used to substantiate the ideas presented on the effect of hydrogen on the nucleation of twins and cracks in this alloy,