Revealing the Subsurface Basal 〈a〉 Dislocation Activity in Magnesium Through Lattice Rotation Analysis

Abstract

A method was proposed in this study to reveal the subsurface basal dislocation activity in Mg-Y alloy and determine the corresponding Burgers vector. This is achieved by correlating the slip directions of dislocations to the lattice rotation represented by the {0001} pole figure. The identified basal slip system by this approach was verified by micro-Laue diffraction. This method can be applied as a complementary method to the conventional slip trace analysis to study the dislocation behavior of Mg alloys.

Recent Progress of Synchrotron X-Ray Imaging and Diffraction on the Solidification and Deformation Behavior of Metallic Materials

“…Differential aperture X-ray microscopy (DAXM) was developed on the basis of the aforementioned Laue microdiffraction method [175][176][177][178], with a similar diffraction configuration. The key feature of DAXM was the addition of a wire placed in the path of the diffraction beam, which gradually moves along the direction of the incident X-ray, as shown in Fig.…”

“…A voxel-by-voxel forward modeling reconstruction procedure could convert the information above into a series of 2D slices [174,175], and 3D rendering was performed with a similar reconstruction process as the SR-CT. The HEDM technique has been demonstrated on various elements, from aluminum [176] to uranium [177], and to dynamic processes such as in situ tensile [178], cyclic [179], and shock [180] tests.…”

Identification of active slip systems in polycrystals by Slip Trace - Modified Lattice Rotation Analysis (ST-MLRA)

“…This is the case, for instance, of <a> basal slip in the {0001} plane and <c + a> pyramidal II slip in {1122}, that share the same <1100> rotation axis family in the HCP lattice, leading to identical evolution of the grain orientation due to plastic deformation. Other methodologies, such as in situ high resolution digital image correlation (HRDIC), 3D X-ray diffraction and transmission electron microscopy, can also be used to identify the active slip system during plastic deformation [12][13][14][15][16]. For example, the active slip system can be identified with the aid of HRDIC by coupling the information provided by the slip traces with information about the displacement fields around the slip traces obtained from HRDIC [12].…”