In the present research, thixoforming route was carried out in order to enhance the microstructural features of LM28 piston alloy. Typical microstructure of this alloy was composed of coarse, polygonal primary silicon particles, eutectic matrix and intermetallic phases. Thermal analysis was carried out to study the solidification path of the base alloy and determine the major arrest temperature...

We report the application of the technique of infrared transmission to measure the temperature of silicon wafers during the growth of silicon-germanium alloy heteroepitaxial layers in a rapid thermal processing system. The silicon-germanium alloy layers have negligible absorption at 1.3 and 1.55 pm over wide ranges of thickness, composition, and strain condition. The substantial improvement of ...

The development of silicon-based anodes with high capacity and good cycling stability for next-generation lithium-ion batteries is a very challenging task due to the large volume changes in the electrodes during repeated cycling, which results in capacity fading. In this work, we synthesized silicon alloy as an active anode material, which was composed of silicon nanoparticles embedded in Cu-Al...

Abstract: Thermal fatigue is a stochastic process often showing considerable scatter even in controlled environments. Due to complexity of thermal fatigue, there is no a complete analytical solution for predicting the effect of this property on the life of various components, subjected to severe thermal fluctuations. Among these components, one can mention car cylinder, cylinder head and pi...

Building the Nano composites for getting material with combinational properties and improving properties of currently used material has been taken significant attention. One of the ways of building Nano composites is using a method known as powder metallurgy. Because with this method not only wastes are decreased to minimum but we can also mix the materials with high melting point with the mate...

We propose a complete model for the oxidation of silicon-germanium. Our model is capable of predicting, as a function of time, the oxide thickness, the profile of the silicon in the underlying alloy, and the profile of germanium in the oxide. The parameters of the model vary with temperature, alloy composition and oxidizing ambient. The model shows excellent agreement with published results, wi...

The growth of epitaxy of silicon–carbon (Si1−yCy) alloy layers on (1 0 0) silicon substrates by chemical vapour deposition (CVD) with a novel precursor, neopentasilane, as the silicon source gas and methylsilane as the carbon source is reported. High quality Si1−yCy alloy layers at growth rates of 18 nm min−1 and 13 nm min−1 for fully substitutional carbon levels of 1.8% and 2.1%, respectively,...

A self-assembly process is reported in which spiral patterns of gold nanoparticles form on silicon surfaces during the epitaxial crystallization of thin gold-silicon alloy layers. This behavior is observed only for gold concentrations above a critical value and is shown to result from two-dimensional compositional banding of a liquid alloy layer during the crystallization process. The compositi...

this research concentrates on the effects of low frequency, vertical mechanical vibration during solidification on the microstructure and mechanical properties of a380 aluminum alloy. two series of sr-modified and al-5ti-b grain refined a380 alloy samples were solidified in both static and dynamic conditions in the frequency and amplitude of 60 hz and 0.2 m, respectively. their physical, micro-...

Silicon–germanium alloys offer a system where the ratio of the electron impact ionization coefficient ~a! and hole impact ionization coefficient ~b! varies from a value larger than unity ~in high silicon content alloys!, to a value smaller than unity ~in high germanium content alloys!. We report results for a and b for this alloy system. The electron results are based on a multivalley nonparabo...