[en] Aging studies on uranium-6 weight percent niobium alloy were performed at temperatures of 500 and 600⁰C. Mechanical-property measurements and microstructural analyses were used to characterize the aging response of the alloy. An attractive combination of mechanical properties was produced by aging at 550 to 600⁰C; namely, a 0.2% offset yield strength greater than 730 MPa with an elongation of 15 to 18%. Increasing the aging time at temperature minimized the variability in mechanical properties. Niobium homogeneity and heating rate influenced the properties and microstructure of the alloy