The microstructure and hydriding characteristics of high temperature aged U–13 at.%Nb alloy

Ji, Hefei; Shi, Pengjun; Li, Ruiwen; Jiang, Chunli; Yang, Jiangrong; Hu, Guichao

doi:10.1016/j.jnucmat.2015.03.051

Cited by 10 publications

(1 citation statement)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the above findings, it has been universally concluded that some particular positions on or in the U nearsurface region can be investigated as initial nucleation sites, with the aim of determining the hydriding characteristics. Previous results 11,[17][18][19] also indicate that hydride nucleates at the α-U-U 2 Ti boundary, and that H reacts preferentially with α-U. With regards to the nucleation and growth stage, Hill et al 13 and Scott et al 20 have found the phenomenon of hydride expansion in a particular direction (i.e., twinning).…”

Section: Introductionmentioning

confidence: 94%

Mechanism of surface uranium hydride formation during corrosion of uranium

Pan

et al. 2019

npj Mater Degrad

Self Cite

View full text Add to dashboard Cite

Uranium is widely used in the nuclear industry and it is well known that uranium hydride, UH 3 , forms when uranium is exposed to air. The associated volume change during this transition can cause the surface region to crack, compromising structural integrity. Here, hydriding regions beneath hydride surface craters are studied by secondary ion mass spectroscopy (SIMS) and X-ray photoelectron spectroscopy (XPS). Our results indicate that strain transition regions exist, which are induced by hydrogen with a certain thickness between hydride craters and the uranium bulk. The SIMS and XPS results suggest that hydrogen exists covalently with uranium and oxygen in these transition regions. A micro-scale induction period model based on the transition region and previous hydriding models is developed. Within the so-called micro-scale induction period, hydrogen diffuses and accumulates at particular sites before reaching the critical concentration required to form stoichiometric UH 3 in the transition regions.

show abstract