The Relationship between Crystal Rotation Axis Orientation and Active Slip System in Pure Aluminum Tricrystal Deformed in Compression

Abstract

The relationship between crystal rotation axis orientations and active slip systems was investigated in an aluminum tricrystal deformed under compression to a strain of 0.15. Schmid factors of slip systems were examined for three component crystals. After compression, slip bands near a triple junction were observed using a scanning electron microscope. Crystal rotation axis orientations were calculated by comparison of the crystal orientations before and after deformation. One of the three component crystals yielded various crystal rotation axis orientations. The active slip systems in the crystal, which generate crystal rotation relative to the initial orientation, were estimated from the slip bands, crystal rotation axis orientations, Schmid factors and ⟨112⟩ lattice rotation axis orientations. Here, the lattice rotation axis orientations are assigned to individual slip systems, since they operate toward ⟨110⟩ directions on {111} planes. Based on the estimation of active slip systems, in an area far from the triple junction of the crystal, the crystal rotation relative to the initial orientation was introduced by imbalance operation of the primary and additional slip systems. In the vicinity of the triple junction, the crystal rotation was generated by three slip systems with different amounts of slip operations. The two additional slip systems on the same slip plane were partially activated along a straight boundary.