In order to investigate the effects of specimen size on the ductile-to-brittle transition characteristics, three-point bend tests at temperatures from liquid nitrogen temperature to room temperature were carried out for recrystallized sheets of pure molybdenum with different specimen width and thickness. In this study the ductile-to-brittle transition characteristics of the material are represented by two parameters, critical stress and critical temperature.
The results are summarized as follows.
(1) In the case of specimen thickness being 1.0mm, the effects of specimen width ranging 4-1mm on the critical stress and critical temperature were almost negligible.
(2) In the case of specimen width being 4mm, critical stress and critical temperature of the specimens with specimen thickness ranging 1.0-0.5mm were almost the same. However critical temperature of the specimen with specimen thickness of 0.3mm was lowered, though critical stress was only slightly decreased.