Influence Of Pre-annealing Research Articles

Influence of sub-Tg annealing on the crystallization kinetics of Cu47Ti33Zr11Ni8Si1 metallic glass

The influence of sub-Tg preannealing on the crystallization of Cu47Ti33Zr11Ni8Si1 metallic glass powders is investigated by differential scanning calorimetry. Sub-Tg treatment induces changes in the isochronal calorimetry traces. Isothermal investigations show that transformation occurs by nucleation and growth, and there is no influence of the preannealing on the transformation kinetics in terms of the Avrami constant. Crystallization occurs by an increasing nucleation rate. A gradual but significant difference is observed in the calculated values of the activation energy. The decrease in activation energy of nanocrystallization can be explained on the basis of increased short-range ordering caused by preannealing.

The Influence of Pre-Annealing on Recrystallization in Heavily Cold-Rolled Nickel

Polycrystalline nickel (99.999% purity) cold-rolled to a reduction of 96% has been given a two-step annealing treatment consisting of a pre-annealing at 180 °C or 220 °C for 2 hours, followed by a final annealing at 300 °C for 10 minutes. The changes in microstructure and texture during annealing have been followed using electron backscatter diffraction orientation measurements taken on the longitudinal section of the samples. The results suggest that pre-annealing at low temperature can enhance the formation recrystallized grains of cube orientation. Based on an analysis of the experimental data, possible reasons for the enhancement as a result of pre-annealing in the formation of cube orientation grains are discussed.

Influence of Pre-Annealing and Additional Deformation on the Recrystallization Texture of High-Purity Aluminum Foils

Influence of Pre-Annealing and Additional Deformation on the Recrystallization Texture of High-Purity Aluminum Foils

Influence of Preannealing on Perfection of Czochralski Grown Silicon Crystals Subjected to High Pressure Treatment

The effect of high temperature (up to 1120 ° C)—high pressure (up to 1.1 GPa) treatment mr tle resulting defect structure of preannealed (450-725°C, up to 96 hours) Czochralski grown Si crystals was studied by X-ray diffraction. The values of the Debye-Waller static factor and of the root-mean-square atomic dispalacement due to defects were determined for various Laue reflections. Well-defined development of the cluster like defect structure after high temperatnre pressurization depending to a substantial extent mi the preannealing conditions was observed. PACS numbers: 61.70.-r, 81.40.-z

Helical magnetic anisotropy induced by current annealing under torsion in Co-rich amorphous wires

The structural relaxation and helical magnetic anisotropy induced by current annealing in Fe-based amorphous alloy wires are investigated. Measurements of these effects have been carried out using the variation of the hysteresis loop and the inverse Wiedemann effect, respectively. Annealing at 550 mA for 1 min results in a fully square hysteresis loop, indicating a complete relaxation. Helical magnetic anisotropy has been induced by annealing under a constant torsional strain. The influence of preannealing and relaxation on the helical anisotropy was also investigated. The behavior of the helical magnetic anisotropy seems to confirm the assumption of separability of the helical anisotropy into at least two terms of opposite directions. >

Helical magnetic anisotropy induced by current annealing under torsion in amorphous wires

The structural relaxation and helical magnetic anisotropy induced by current annealing in Fe-based amorphous alloy wires are investigated. Measurements of these effects have been carried out using the variation of the hysteresis loop and the inverse Wiedemann effect, respectively. Annealing at 550 mA for 1 min results in a fully square hysteresis loop, indicating a complete relaxation. Helical magnetic anisotropy has been induced by annealing under a constant torsional strain. The influence of preannealing and relaxation on the helical anisotropy was also investigated. The behavior of the helical magnetic anisotropy seems to confirm the assumption of separability of the helical anisotropy into at least two terms of opposite directions.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>