抄録
Coarse grained polycrystalline aggregates of high-purity iron (99.996 at. %) have been fatigued in alternating bending at room temperature, and the behavior of individual grains has been studied by the X-ray technique together with optical microscopy. The fatigue deformation of the grains in the aggregates is found as fairly influenced by the crystal orientation. A grain possessing the orientation near the <001>-<011> side of stereographic triangle shows slip traces, while another grain near the <111> corner gives no trace of slip. In particular cases, the traces are exhibited also on the {001} plane when the crystallographic conditions are favorable for cleavage fracture. Because of the constraints of the surrounding grains, the microstructural change of deformation is much more complicated in the grain sited in the central part of the specimen than that located in the fringes of the specimen, even when both the grains possess resembling orientations. Localized slip zones are formed in the grain with definite orientation. The mechanism of fatigue deformation of b. c. c. metals is discussed in connection with crystallographic observations.
