X-ray diffraction study of low temperature aging in U–5.8 wt.%Nb

Effect of grain size on phase stability of monoclinic U–Nb alloy during low-temperature aging

“…As expected [26], the a 00 / g phase transformation takes place in all samples during aging at 200 C. The detail analysis of phase transformation during aging in fine-grained sample has been done in our previous work [26]. Fig.…”

“…The aging mechanism of phase transformation between a 00 and g has been disclosed in our previous work [26]. The effects of grain size on the phase stability of a 00 UeNb alloy during aging at lowtemperature were investigated in this paper using X-ray line profile analysis (LPA) method [27e30].…”

“…The 800 C and 1050 C gamma-anneal were used to fine grained specimens and coarse-grained specimens respectively. Specimen preparation, XRD setup, and pattern analysis were the same as that reported earlier [26].…”

“…Fig. 2 shows the XRD patterns of fine-grained sample and coarse-grained sample, which both present single-phase a 00 structure, a distorted structure of a-U [14,21,26,31]. The preferred orientation is remarkable in the XRD pattern of coarse-grained sample because large grain size results in fewer grain irradiated by X-ray.…”

Straightforward understanding of the structures of metastable α″ and possible ordered phases in uranium–niobium alloys from crystallographic simulation

“…For this reason, the analysis on structure of a 00 phase is usually performed in an indirect or incorrect way. For example, in a current and early work [13,14], diffraction pattern of a 00 phase is indexed by the orthorhombic and triclinic a lattice, respectively.…”