Isothermal solidification process of pure metal Al was studied by molecular dynamics (MD) simulation using EAM potential. The effects different cooling rates on the isothermal metallic were studied. first subjected to a rapid process, and then it annealing under conditions. mean first-passage times (MFPT) method Johnson-Mehl-Avrami (JMA) law used qualify kinetic processing, nucleation rate, cri...

The kinetics of isothermal desorption of hydrogen from InNð000 1Þ have been investigated using surface vibrational spectroscopy. Reductions in intensity of the N–H stretching and bending vibrations in high resolution electron energy loss spectra (HREELS) upon annealing indicated loss of surface hydrogen and was attributed to recombinative desorption. Hydrogen completely desorbs from the InN sur...

Hall Effect measurement was employed to study the isothermal annealing of boron or phosphorus implanted polycrystalline Si1-xGex thin films, with x varying from 0.3 to 0.55. Xray diffraction and cross-sectional transmission electron microscopy were used to study the crystal structure, while X-ray photoelectron spectroscopy was used to determine the film composition and the chemical bonding stat...

Two different aspects of the thermal stability of grains were studied – (i) thermal stability of grain structure evolution during friction stir processing (FSP), and (ii) thermal stability of grains after FSP. It was concluded that Al3(Sc,Zr) dispersoids are effective in limiting grain growth to ultrafine grained regime (UFG) by stabilizing the microstructure during FSP. The presence of these d...

Exposing uranium-molybdenum alloys (UMo) retained in the γ phase to elevated temperatures leads to transformation reactions during which the γ-UMo phase decomposes into the thermal equilibrium phases, i.e. U2Mo and α-U. Since α-U is not suitable for a nuclear fuel exposed to high burn-up, it is necessary to retain the γ-UMo phase during the production process of the fuel elements for modern hig...

Isothermal dielectric loss spectra of neutralized and nonneutralized chitosan were acquired in successive runs from -130 degrees C up to increasing final temperatures, in a frequency range between 20 Hz and 1 MHz. Essentially, three relaxation processes were detected in the temperature range covered: (i) a beta-wet process, detected when the sample has a higher water content that vanishes after...

The superlattice intermixing of arsenic-rich nonstoichiometric AlAs/GaAs quantum wells grown at lowsubstrate temperatures around 300 °C is enhanced by several orders of magnitude relative to diffusion in stoichiometric structures grown at ordinary substrate temperatures. The transient enhanced intermixing is attributed to a supersaturated concentration of group-III vacancies grown into the crys...

The effect of lithium on the structural-phase state aerospace aluminum alloy 1421 Al–Mg–Li system prepared by rapid solidification is studied. Analysis composition surface layers samples carried out means nuclear reaction analysis establishes that diffuses to at elevated treatment temperatures and its concentration in a thin layer (0.1 μm) reaches 38 %, which 4.8 times higher than calculated Li...

In this paper, nitrogen diffusion is investigated in single-crystalline austenitic stainless steel during modified layer formation and thermal annealing. A generalized system of equations derived within a thermodynamic framework from Fick’s laws, which describe flux under multiple driving forces, including concentration gradient the hydrostatic stress. Trapping detrapping phenomena are consider...