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The effect of Al atoms in solid solution on the critical resolved shearstress for twin nucleation and growth was analyzed by means of the combinationof diffusion couples with compression tests in micropillars oriented fortwinning. The critical resolved shear stress for twin nucleation was higherthan that for twin growth and both increased by the same amount with the Alcontent. Nevertheless, the increase was small ( approx. 10 MPa) for 4 at.%Albut large (up to 60-70 MPa) for 9 at.%Al. These results were in agreement withLabusch-models based on first principles calculations in the dilute regime (< 5at.%Al) [51]. Comparison with recent data in the literature showed that Alatoms are more effective in increasing the critical resolved shear stresses fortwin nucleation and growth than for basal slip [21]. Finally, compression testsin micropillars oriented along [0001] showed the critical shear stress forpyramidal slip increased rapidly with the Al content from 98 MPa in pure Mg to250 MPa in Mg-9 at.%Al. Thus, the addition of Al increased the plasticanisotropy of Mg alloys.

Effect of Al content on the critical resolved shear stress for twin nucleation and growth in Mg alloys