Tension-compression asymmetry in hot-rolled Mg-3wt%Gd alloy under creep loading

Comprehensive Study on the Age-Strengthened Mg–Zn–Mn–Ca/ZnO Composites for Fracture Fixation: Microstructure, Mechanical, and In Vitro Biocompatibility Evaluation

“…This higher c / a ratio corresponds to a reversed yield asymmetry of 2.38, a considerably higher value. The trend of increasing c / a values aligns with the reversed yield asymmetry, indicating that materials having greater values are more prone to basal slip, and it is further uncommon in tension than compression. ,, The higher c -axis to a -axis length ratio in the hexagonal close-packed (HCP) crystal lattice encourages compression-induced twinning, while prismatic slip, requires a higher critically resolved shear stress (CRSS). , Previous studies have shown that the occurrence of twinning in HCP crystals depends on the ( c / a ) ratio, with {10–12} twinning favored under tension when ( c / a ) < √3, and under compression when ( c / a ) > √3 . Unlike Ti and Zr (also having HCP structure), where twinning occurs on various planes, in Mg, twinning is exclusive to the {10–12} plane .…”

“…41,43,44 The higher c-axis to a-axis length ratio in the hexagonal close-packed (HCP) crystal lattice encourages compression-induced twinning, while prismatic slip, requires a higher critically resolved shear stress (CRSS). 45,46 Previous studies have shown that the occurrence of twinning in HCP crystals depends on the (c/a) ratio, with {10−12} twinning favored under tension when (c/a) < √3, and under compression when (c/a) > √3. 47 Unlike Ti and Zr (also having HCP structure), where twinning occurs on various planes, in Mg, twinning is exclusive to the {10−12} plane.…”

Tensile-Compressive Asymmetry in Extruded Az31b Rod and its Effect on Profilometry-Based Indentation Plastometry (Pip)

“…Some of the studies with extruded rods have also involved tensile testing in the radial direction, whereas none of the work with sheet or plate has involved tensile testing in the through-thickness direction (and most have not involved compressive testing in that direction either). This type of tensile testing was included in recent work by Li et al [31] on Mg-3%Gd plate, although that study is focussed on creep behaviour. Nevertheless, they do make some interesting observations regarding the twin and slip systems being activated during creep deformation.…”