53rd Magnetic Materials Center Seminar
August 3, 2007, 9:00
7th floor seminar room, Sengen
３DAP and TEM analysis of (Fe0.85B0.15)1-xCux Nanocrystalline soft magnetic allyos
Y. Chen
The newly developed FeBCu soft magnetic alloys produced by melt-spinning. The alloys annealed at 390℃ for 1h consist of nanoscale grains. The annealed alloys show excellent magnetic properties such as 1.8T high saturation magnetic flux density and a low core loss.
For the present alloys, microstrustures were sutdied by 3DAP and TEM analysis which indecate the addition of Cu is effective for the formation of nanoscale grains and the improvement of the soft magnetic properties.

Nanostructure analysis by laser assisted 3D atom probe
T. Ohkubo
3D atom probe (3DAP) is a unique analytical technique that can map out three dimensional elemental distribution of alloys with an atomic resolution. However, only conductive materials can be analyzed by the conventional 3DAP because atoms are ionized by the field evaporation process. Even for the analysis of metallic materials, specimens rupture very frequently before sufficient number of atoms are collected because a very high electric field must be applied to induce field evaporation, which causes a larger field stress than the yield stress of the material at the tip apex. In this talk, we demonstrate several examples of laser assisted 3DAP results of the materials that are difficult to analyze with the conventional voltage pulse mode.