2003 年 52 巻 9Appendix 号 p. 196-203
Peculiar deformation accompanied by Lüders band having 46% Lüders strain was observed in the  oriented Fe-30%Cr alloy single crystal. Specimen was again deformed after aging at 473K for 1.8ks at the 23.5% strain. The first Lüders band can not move due to locking by aging and second Lüders band started from the opposite side of the chuck. The specimen having  tensile axis is thought to begin to slip ideally by four slip directions. In the present case, this specimen deformed by slip of  and  directions. Thus, the slip system of Lüders band could be determined. From the surface observation of the side surface of the specimen, the propagation speed, width and the strain-rate in the Lüders band were determined. The mobile dislocation density in the Lüders band was also estimated to be about 2×108cm/cm3. The effective and internal stresses were determined during the straining in order to analyze the mechanism of Lüders deformation.