Abstract
Ti-Gd alloys with Gd contents of 2 wt%–8 wt% were prepared, and the influence of Gd content on the microstructure, mechanical properties, corrosion behavior, neutron absorption property and density of the alloy weas investigated. The microstructure changes from full lamellar α phase to fine equiaxed crystals, and the area fraction of Gd-rich phase decreases from 3.2% to 1.8% and then increases to 9.1%. Gd has three existing forms: pure Gd, compound oxide of Gd2TiO5 and/or Gd2O3 and solidifies in the Ti matrix. Ti-4Gd exhibits the best mechanical properties, its tensile strength and elongation is 102 MPa and 49%, respectively. The neutron transmittancy of Ti-8Gd alloy in water is the lowest, which is 3.75%. The corrosion rate of Ti-Gd alloy is 0.00097–0.00238 mm/a, which meets the corrosion standard of small-scale nuclear reactors and containers for spent fuel.
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