Concepts for the design of advanced nanoscale PVD multilayer protective thin films

Titanium nitride (TiN) is one of the most well-established engineering materials nowadays. TiN can overcome most of the drawbacks of palsmonic metals due to its high electron conductivity and mobility, high melting point and due to the compatibility of its growth with Complementary Metal Oxide Semiconductor (CMOS) technology. In this work, we review the dielectric function spectra of TiN and we evaluate the plasmonic performance of TiN by calculating (i) the Surface Plasmon Polariton (SPP) dispersion relations and (ii) the Localized Surface Plasmon Resonance (LSPR) band of TiN nanoparticles, and we demonstrate a significant plasmonic performance of TiN.

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Optical Properties and Plasmonic Performance of Titanium Nitride

Effect of RE oxides on the microstructure of the coatings fabricated on titanium alloys by laser alloying technique

Effect of magnesium addition on the wetting of alumina by aluminium

Toughness enhancement in TiN/WN superlattice thin films

Coherent growth and superhardness effect of AlN/TiN nanomultilayers

Effect of La on the wettability of Al2O3 by molten aluminum

Microstructure of nanometer Al2O3 particles reinforced aluminum matrix composites processed by high pulsed electromagnetic field

AZ91 magnesium alloy was subjected to a deep cryogenic treatment. X-ray diffraction (XRD), scanning electronic microscopy (SEM), and transmission electronic microscopy (TEM) methods were utilized to characterize the composition and microstructure of the treated samples. The results show that after two cryogenic treatments, the quantity of the precipitate hardening β phase increases, and the sizes of the precipitates are refined from 8–10 μm to 2–4 μm. This is expected to be due to the decreased solubility of aluminum in the matrix at low temperature and the significant plastic deformation owing to internal differences in thermal contraction between phases and grains. The polycrystalline matrix is also noticeably refined, with the sizes of the subsequent nanocrystalline grains in the range of 50–100 nm. High density dislocations are observed to pile up at the grain boundaries, inducing the dynamic recrystallization of the microstructure, leading to the generation of a nanocrystalline grain structure. After two deep cryogenic treatments, the tensile strength and elongation are found to be substantially increased, rising from 243 MPa and 4.4% of as-cast state to 299 MPa and 5.1%.

Microstructure and mechanical properties of AZ91 magnesium alloy subject to deep cryogenic treatments

The invention relates to alloy steel smelting, and particularly relates to a chrome-molybdenum metal self reduction pellet and preparation and direct steel liquid alloying methods thereof. The pellet comprises the following components according to mass percentage: 40-65 percent of high-carbon ferrochrome powder, 15-40 percent of molybdic oxide powder, 5-15 percent of a reductant and 3-5 percent of a flux. The self reduction pellet product is added to a ladle during electric furnace or convertor tapping, under the action of high-temperature molten steel and a pellet inner reductant, metal elements in the pellet are effectively reduced, as a result, the molten steel is directly alloyed; the self reduction pellet product is applied in alloy steel including stainless steel, wear resistant steel and the like, which contain elements Cr and Mo, and not only is the procedure for the production of ferro molybdenum saved, but also the elements Cr and Mo can be added at one time, so that the cost of adding alloy elements is lowered, the smelting cycle is shortened, meanwhile, the use range of high-carbon ferrochrome is widened, and furthermore, the problem that the element Mo is difficult to add and settle and great in volatilization during the steel smelting is solved.

Guirong Li

Papers

Coherent growth and superhardness effect of AlN/TiN nanomultilayers

Effect of La on the wettability of Al2O3 by molten aluminum

Microstructure of nanometer Al2O3 particles reinforced aluminum matrix composites processed by high pulsed electromagnetic field

Microstructure and mechanical properties of AZ91 magnesium alloy subject to deep cryogenic treatments

Chrome-molybdenum metal self reduction pellet and preparation and direct steel liquid alloying methods thereof