TEPM

Carbon nanotubes, long, thin cylinders of carbon, about 10.000 times thinner than a human hair, were discovered in 1991 by Sumio Iijima. These are large macromolecules that are unique for their size, shape, and remarkable physical properties. From chemical point of view, the ...

The formation and dynamics of aluminum laser produced plasma are experimentally and theoretically investigated. The visible emitting regions of plasma form two structures of different expansion velocities. Such behavior is in agreement with the transient current recorded by a cylindrical Langmuir probe. Using the hydrodynamic model of scale relativity theory, the plasma dynamics at different time scales are numerically and analytically analyzed. #

The paper presents the obtaining of shape memory alloys, base copper and a diffractometer and microscopic study on some samples. The study was made on CuZnAl samples, obtained by classic casting and educated. The shape memory alloys properties recommend their use for applications in domains as follows electric contacts, robotics, and aeronautics. When choosing the type of alloy used for the manufacture of the component parts of different industrial applications, it must be taken into account fatigue resistance, resistance to shocks and resistance to corrosion. Shape memory alloys are a unique group of alloys with the ability to remember a form even after quite severe plastic deformations. At low temperatures, shape memory alloys can be deformed apparently like other metallic alloys, but this deformation can recover with a relatively modest increase in temperature. 2. The second stage involves storing tension, by the action of external forces, the martensitic state, strong macles. Macroscopic deformation occurs by migration limits macles and increases those variables that are most favorably oriented to the applied voltage.

This paper presents experimental tests made on samples of type RUL2 steel sample subjected to heat treatments annealing, hardening martensitic and low recovery. Improving the physical and mechanical characteristics of bearing steels used in construction machinery is a prerequisite to ensure the best reliability bearing.

The paper presents the study of corrosion phenomena for CoCrMo and CoCrMoSi5 alloys, in biological fluids, like citric acid (unpasteurized fresh orange juice). The study was made by electrochemical methods, using potentio-dynamic method and electrochemical impedance spectroscopy. It was found that CoCrMoSi5 alloy present high properties and may be used to medical applications.

The paper presents a comparative study about the modifications of microstructure and mechanical properties, for 2 alloys for Co-Cr-Mo system alloys. The structural modification are evidenced by complex microscopic analysis made on a metallographic microscope and an electronic microscope coupled with EDX detector, but also by X-ray diffraction analysis, determining the inter-metallic compounds and phases specific to cast state of analyzed alloys. In terms of mechanical properties, the standard samples from analyzed alloys was subject to tensile test and hardness measurements. The obtained values both for CoCrMoSi1Mn1 alloy, and for allied alloys with 5%Si (CoCrMoSi5Mn1), are subject to standard limits of metallic alloys, with medical applications.

The paper presents a comparative study about the modifications of microstructure and mechanical properties, for 2 alloys for Co-Cr-Mo system alloys. The structural modification are evidenced by complex microscopic analysis made on a metallographic microscope and an electronic microscope coupled with EDX detector, but also by X-ray diffraction analysis, determining the inter-metallic compounds and phases specific to cast state of analyzed alloys. In terms of mechanical properties, the standard samples from analyzed alloys was subject to tensile test and hardness measurements. The obtained values both for CoCrMoSi1Mn1 alloy, and for allied alloys with 5%Si (CoCrMoSi5Mn1), are subject to standard limits of metallic alloys, with medical applications.