Experiments were performed to observe the effects of processing and composition on the grain boundary character distribution (GBCD) of SrTiO3, MgO, and Ni. Anisotropic interfacial energies and, in the case of nickel, crystallographic constraints, are expected to influence the evolution of the GBCD during processing. Interrupted grain growth experiments were performed with SrTiO3 to observe the ...

Because of the complex nature of internal interfaces it has been a continual challenge to link the grain growth behavior of alumina (especially the onset of abnormal grain growth) to the internal interface structure and chemistry, and the associated atomic transport rate. The present work considers the problem of normal and abnormal grain growth development in calcia-doped alumina, a system not...

A research program has been established to study ion beam enhanced grain growth (IBEGG). Ion beam enhanced grain growth has been studied experimentally in Ge, Au and Si films. IBEGG has been characterized by varying the ion dose, ion energy, ion flux, ion species, temperature, and thin film deposition onrditions. The effect of these parameters on grain size and microstructure has Leen analyzed ...

in order to investigate the effect of pruning and potassium nutrition on pumpkin grain yield and quality, a factorial experiment based on complete block design with four replications was carried out in nooshar village of ardabil province, ardabil, iran, in 2007. experimental factors include potassium nutrition in three level (0, 75 and 150 kg/ha from potassium sulfate) and stem pruning (without...

Grain boundaries are effective sinks for radiation-induced defects, ultimately impacting the radiation tolerance of nanocrystalline materials (dense materials with nanosized grains) against net defect accumulation. However, irradiation-induced grain growth leads to grain boundary area decrease, shortening potential benefits of nanostructures. A possible approach to mitigate this is the introduc...

A novel method is presented for growth of polycrystalline silicon films on amorphous substrates at temperatures of 540-575 “C. Grain nucleation and grain growth are performed in two steps, using Si nanocrystals as nuclei (“sceds’“,L The nanocrystal seeds are produced by excimer laser photolysis of disilane in a room temperature flow cell. Film (grain) growth occurs epitaxially on the seeds in a...

A method for extracting the parameters describing the process of grain growth from calorimetric data is presented. Both isothermal and scanning experiments are considered. It is demonstrated that the Kissinger method used for determining the activation enthalpy of a nucleation-and-growth process can be used for a grain growth process as well. Characteristic differences between the signals, both...

Grain growth, a competitive growth of crystal grains accompanied by curvature-driven boundary migration, is one of the most fundamental phenomena in the context of metallurgy and other scientific disciplines. However, the true picture of grain growth is still controversial, even for the simplest (or ‘ideal’) case. This problem can be addressed only by large-scale numerical simulation. Here, we ...

In order to investigate the effect of pruning and potassium nutrition on pumpkin grain yield and quality, a factorial experiment based on complete block design with four replications was carried out in nooshar village of ardabil province, Ardabil, Iran, in 2007. Experimental factors include potassium nutrition in three level (0, 75 and 150 kg/ha from potassium sulfate) and stem pruning (without...