The characterization of borided pure tungsten
This study reports on mechanical properties of borided pure tungsten. Boronizing heat treatment was performed in a solid medium consisting of Ekabor powders at 940 °C for 2, 4, and 8 h. The presence of WB on the surface of pure tungsten was confirmed by XRD analysis. Metallographic studies revealed an almost uniform and compact boride layer on the surface of the pure tungsten. The thickness of boride layer ranged from 10 to 42 μm with some scatters. The hardness of borided specimens decreased with the distance from the surface to the interior of the test material. The hardness of the boride on the substrate was 2500 HV while the hardness of the substrate was 445 HV.
In the footsteps of our previous work \cite{RamatonBoschi} we generalize the Stefan-Boltzmann and Wien's displacement laws for the $ \textrm{AdS}_5 \times {\cal S}^5 $ spacetime, the background of the AdS/CFT correspondence foremost realization. Our results take into account the $ \textrm{AdS}_5 \times {\cal S}^5 $ full dimensionality in the electromagnetic field $A^{\mu}$ wave equation, which yields the higher-dimensional blackbody characteristic features suggested in literature. In particular, the total radiated power and the spectral radiancy match the original Stefan-Boltzmann and Wien's displacement laws in the low-energy regime up to available experimental data.