Evaluation of stainless steel under tensile stress using positron microbeam

Maekawa, Masaki; Yabuuchi, Atsushi; Kawasuso, Atsuo

We have developed a positron microbeam based on the commercial scanning electron microscope. The minimum beam diameter 1.9 micron on target was confirmed. Using this, vacancy-type defects in the small area can be detected. This means that the positron microbeam has a great advantage for the measurement under the extreme condition, such as high temperature, high tensile stress, high electric field, high pressure and so on, because it become easier to apply such condition when the sample size was smaller. We have applied the positron microbeam for the sample under tensile stress and high temperature.