Study of basal < a > and pyramidal < c + a > slips in Mg-Y alloys using micro-pillar compression

The effect of yttrium (Y) on the critical resolved shear stresses (CRSS) of < a > basal slip, $\left\{101¯2\right\}⟨1¯011⟩$ tension twinning and < c + a > pyramidal slip has been studied using micro-pillar compression tests along selected orientations at room temperature, on two magnesium (Mg) alloys with different Y contents (0.4 and 4 wt.%). The CRSS of < a > basal slip increased slightly from 30 ± 1 MPa (for Mg-0.4Y) to 37 ± 3 MPa (for Mg-4Y). In Mg-0.4Y, the resolved shear stress to activate the $\left\{101¯2\right\}⟨1¯011⟩$ tension twin was determined to be 45 ± 12 MPa, while in Mg-4Y it was 113 MPa. The compressed samples were studied using scanning electron microscopy (SEM), transmission Kikuchi diffraction (TKD) and transmission electron microscopy (TEM). It was found that < c + a > dislocations slip mainly on $\left\{1¯1¯22\right\}$ (Pyra II) planes with a CRSS of about 119 MPa in Mg-0.4Y and slip mainly on $\left\{01¯11\right\}$ (Pyra I) planes in Mg-4Y with a CRSS of 106 MPa. There is a significantly lowered CRSS ratio between < c + a > slip and < a > basal slip in both alloys (2.8 and 4.8) compared with that reported in bulk pure Mg (∼100). The easy activation of < c + a > on Pyramidal I slip is expected to promote the frequent cross-slip in Mg-4Y alloy.