발간논문

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This study was carried out to investigate the effect of thermo-mechanical treatment on the damping capacity of 316L stainless steel. α` and ε-martensite were formed by deformation. α`-martensite and stacking faults were formed by thermo-mechanical treatment, and the volume fraction of α`-martensite and stacking faults were rapidly increased by an increasing number of cycles of the thermo-mechanical treatment. With the increasing number of cycles, the damping capacity increased. The damping capacity increased with increasing stacking faults formed by thermo-mechanical treatment. Thus, the damping capacity of thermo-mechanical treated 316L stainless steel was strongly affected by stacking faults. The results confirmed that a good combination of strength and damping capacity was obtained from thermo-mechanical treatment.

keyword : metals, thermo-mechanical processing, damping, stacking fault, transinission electron microscopy, TEM

Anode materials of the Na-Sn battery experience a series of phase transitions during charging and discharging. These phase transitions in many cases are accompanied by a large volume change in the electrode materials, which leads to pulverization, a major source of reducing the battery capacity. In contrast to the rich literature on the phase transition behaviors of the Li-Si battery, those of the Na-Sn battery are much less understood due to experimental difficulties in determining the chemical composition of the phases. In this study, we demonstrate a simple method of analyzing the composition of the reaction compounds of the Na-Sn battery electrodes using energy dispersive X-ray spectroscopy.

keyword : energy storage mateuals, diffusion bonding, phase transformation, focused ion beam, FIB, sodiation, Energy-dispersive x-Ray spechoscopy, EDS