AISI 5120 steel, which underwent 30 min single-surface nanocrystallization via supersonic fine particle bombarding (SFPB), was pre-boronized at 600 °C for 2 h, and then final-boronized 800 or 900 2–6 i.e., two-step pack-boronizing. The specimens’ microstructure mechanical characteristics before after boronizing were examined in detail. results showed that the hardness of SFPB surface reached 57...

The classical theory of solid-state transformation based on nucleation and growth processes, developed by Kolmogorov, Johnson Mehl, Avrami (KJMA theory), is widely used in many different fields research. In KJMA theory, two parameters (the frequency factor and, particularly, the exponent) can supply information about mechanisms involved transformation. Despite its apparent simplicity, one hand,...

Abstract: In this research work, crystallization kinetics of Fe55Cr18Mo7B16C4 alloy was evaluated by X-ray diffraction, TEM observations and differential scanning calorimetric tests. In practice, crystallization and growth mechanisms were investigated using DSC tests in four different heating rates. Results showed that a two -step crystallization process occurred in the alloy in which - Fe phas...

Using conventional and high-resolution transmission electron microscopy (HRTEM), the effects of rolling at room temperature on the microstructures of amorphous Al90Fe5Gd5 and Al86.8Ni3.7Y9.5 were compared. In rolled Al90Fe5Gd5, nanocrystallites were observed at shear bands, whereas none were observed in rolled Al86.8Ni3.7Y9.5. When HRTEM was combined with with Fourier transform filtering, nanos...