Defence Metallurgical Research Laboratory

About: Defence Metallurgical Research Laboratory is a facility organization based out in Hyderabad, India. It is known for research contribution in the topics: Microstructure & Alloy. The organization has 1208 authors who have published 2662 publications receiving 51663 citations.

Effect of Minor Additions of Boron on Microstructure and Mechanical Properties of As-Cast Near α Titanium Alloy

Abstract: This work investigates the effect of boron addition on the microstructure and mechanical properties of a near alpha Ti alloy, Timetal 685 in as-cast plus heat-treated condition. While significant refinement of the prior β grain size is seen with small additions of boron, the thickness of α lath (in transformed β structure) increases with increasing boron. At room temperature (RT), tensile yield strength increases marginally, but the ductility drops significantly possibly because of the cracking of TiB phase. At elevated temperature, significant strengthening is observed in the boron containing alloys especially at higher plastic strains. Additionally, the creep resistance shows significant enhancement with boron addition.

Evolution of Visible Photocatalytic Properties of Cu-Doped CeO2 Nanoparticles: Role of Cu2+-Mediated Oxygen Vacancies and the Mixed-Valence States of Ce Ions

Abstract: We report the contribution of oxygen vacancies for enhancing the optical and visible photocatalytic properties of Cu-doped CeO2 nanoparticles (NPs) synthesized through a low-temperature coprecipitation method. Doping Cu ions in the ceria lattice in different mole percentages, 0, 3, 5, 7, 9, and 15 wt %, results in enhancement of visible photocatalytic properties even under natural sunlight. Transmission electron microscopy and X-ray diffraction studies showcase the monodispersive nature of Cu-doped CeO2 NPs in the size range of 3–7 nm with face-centered cubic structure. The Cu-based defect states induce a narrow band function in ceria nanostructures and influence the red shift in absorption with the Cu concentrations. Visible photocatalytic degradation of methylene blue was investigated in the presence of pure CeO2 NPs, CuO NPs, and Cu-doped CeO2 NPs. These studies revealed that the 7 wt % of Cu-doped CeO2 NPs exhibit the degradation rates of 1.41 × 10–2 and 1.12 × 10–2 min–1 under exposure to natural sun...