Stage B work‐hardening of magnesium single crystals

Abstract

The change in microstructure during tensile deformation of magnesium single crystals by basal slip was studied with electron backscatter diffraction in the scanning electron microscope. Two samples were plastically deformed up to shear strains of 0.37 and 1.28 belonging to work-hardening stages A and B, respectively. The results show that the local misorientations resulting from rotations around the <1010> axis strongly increase the work-hardening coefficient in stage B. The mechanism of work-hardening in stage B is discussed with respect to subgrain formation.

Work Hardening of Magnesium Single Crystals Deformed to Stage B at Room Temperature

“…Suªkowski et al [19] investigated by electron backscattering diraction (EBSD) technique Mg single crystals deformed by tension at room temperature and did not observe twinning, but there was some local rotation of ≈ 7 • of the microstructure resulting from rotations around the ⟨1100⟩ axis. The explanation was that during the deformation by tension at room temperature of Mg single crystals oriented for single slip, the dislocation walls, consisting of edge basal dislocations, were formed, causing consequently a change in local misorientation.…”

Fatigue behavior and microstructure of 0001 and 1̄014 magnesium single crystals under compression–compression cyclic loading

“…Work-hardening behavior of Mg single crystals orientated for basal slip was tested in tension at 4, 78, and 295 K, and the results indicated an easy glide stage followed by rapid hardening and fracture [18]. Sulkowski et al studied Stage B work-hardening of magnesium single crystals [19]. Lung and Wang calculated the critical resolved shear stress as a function of the temperature for Mg single crystals [20].…”

“…On the other hand, the anisotropic behavior of single crystals can be easily characterized separately. A number of research papers were reported on magnesium single crystals [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] under monotonic loading. Plastic deformation behavior through different mechanisms such as nonbasal slip and deformation twinning was investigated for magnesium single crystals under tensile loading [6][7][8].…”

Latent hardening effect under self- and coplanar dislocation interactions in Mg single crystals

“…In Mg single crystals, basal slip is dominant deformation mechanism in a wide range of orientations and over a broad range of temperatures [19][20][21][22][23][24]. The interactions of basal slip with other slip and twinning systems occur frequently during plastic flow and control the work-hardening of Mg.…”