Uranium-titanium alloy system

Calphad thermodynamic description of some binary systems involving U

“…This probably explains the high Ti level of single TiU 2 samples that was the reason for Udy et al to propose a significant homogeneity range for this compound, in disagreement with other works. The two main works by Knapton [16] and Udy and Boulger [15] are in qualitative agreement. Points in disagreement are easily noticeable in Fig.…”

“…However she used lattice stabilities incompatible with SGTE and this cannot be used in the Fuelbase project. During the present reassessment, the experimental phase diagram determined by Buzzard and coworkers [13] are not considered as it is inconsistent with other works due to important contamination but the other experimental phase diagrams previously assessed by Murray [14][15][16][17] as well as the work by Linard [18] that she seems not to have been aware about, all in reasonable agreement. Most of these experimental results are shown on Fig.…”

“…The phase diagram he proposed based on the purer materials is in agreement with the study of Linard [18] performed with U containing 50 and 100 ppm C. The presence of impurities causes an important uncertainty on the phase diagram data derived from most of Knapton [16] results; it can for instance be noticed that some points corresponding to equilibria between the U rich phases and the compounds TiU 2 are on the Ti rich side of the compound. The results by Udy and Boulger [15] actually also present some contamination issues as the observation of titanium carbide is reported. This probably explains the high Ti level of single TiU 2 samples that was the reason for Udy et al to propose a significant homogeneity range for this compound, in disagreement with other works.…”

“…Knapton [16] and Udy and Boulger [15] have studied the entire phase diagram by metallography, X-ray, dilatometry and optical pyrometry. The results from Seybolt et al [14] mostly concern the melting behaviour, those of Adda et al [17], based on diffusion couples and microprobe measurements, cover the solid state in the whole range of composition and those by Linard [18] only the U rich alloys by DTA.…”

First principles application for mechanical properties of Ti-doped W particles enhanced U matrix composite

“…These elements have relatively large solubility in hightemperature phase of c-U (from 1047.8 to 1405.3 K, bcc crystal structure), form continuous solid solution in a wide range of temperatures [2], and hardly dissolve in room temperature phase of a-U (\940.7 K, orthorhombic crystal structure). According to the study of Udy and Boulger [3], a small additional amount of Ti after heat treatment (quenching, aging) can greatly improve the mechanical properties of uranium. The temperature of the reactor beyond 923 K should use uranium matrix composites because the performance of uranium alloy cannot yet meet the surrounding environmental requirements.…”