Orientation Dependence of Bending Deformation Behavior in Magnesium Single Crystals

Abstract

Magnesium single crystals with different orientations were subjected to three-point bending tests, and bending deformation behavior was investigated. With the basal plane parallel to the neutral plane, the specimens deformed due to basal slips and showed gull-shape after deformation. Conversely, with the neutral plane and the axis parallel to (1120) and [1100], the specimen deformed due to {1012} twinning. However, the specimens fractured after a few percent of deformation, subsequently displaying V-shape. The specimens, whose neutral plane and axis were (1120) and [0001], also deformed due to basal slips. The relationship between bending yield stress of the specimens and the critical resolved shear stress of the basal slip, or {1012} twin, is discussed.

Fig. 7 Optical micrographs of (a) appearance of C specimen; (b) {10-12} twins and a crack observed from (c) [0001] and (d) [-1-120] after the bending test.