X線回折援用結晶粒界追跡法によるアルミニウム合金の延性破壊挙動の結晶学的解析

抄録

We have proposed a new diffraction-amalgamated grain-boundary tracking (DAGT) technique, which has been developed by combining the grain boundary tracking (GBT) technique and a pencil beam XRD technique. The method provides a description of the crystallographic orientations of individual grains in polycrystalline materials during deformation in 4D (3D + time).We have applied this method for the evaluation of ductile fracture behavior in a polycrystalline Al-4Cu alloy. We have determined crystallographic orientations for each grain with and without loading using the DAGT technique. It is found that grain orientation behavior is affected by interaction with adjacent grains. 3D strain mapping has revealed highly heterogeneous strain distribution in grains, which undermines conventional grain-averaged evaluation of polycrystalline plasticity.