Abstract
In this work, the generalized stacking fault energies (GSFEs) of {10-11}<11-23> slip system in a wide range of Mg-X (X = Ag, Al, Bi, Ca, Dy, Er, Gd, Ho, Li, Lu, Mn, Nd, Pb, Sc, Sm, Sn, Y, Yb, Zn and Zr) binary alloys has been studied. The doping concentration in the doping plane and the Mg-X system is 12.5 at.% and 1.79 at.%, respectively. Two slip modes (slip mode I and II) were considered. For pure magnesium, these two slip modes are equivalent to each other. However, substituting a solute atom into the magnesium matrix will cause different effects on these two slip modes. Based on the calculated GSFEs, two design maps were constructed to predict solute effects on the behavior of the {10-11}<11-23> dislocations. The design maps suggest that the addition of Ag, Al, Ca, Dy, Er, Gd, Ho, Lu, Nd, Sm, Y, Yb and Zn could facilitate the {10-11}<11-23> dislocations.
Highlights
Magnesium alloys show great potential for application in the automotive and aerospace industry.the use of magnesium alloys is limited by their poor ductility at ambient temperatures [1,2,3,4,5].In hexagonal close-packed (HCP) alloys, the softest deformation mode is the basal slip, which provides only two independent slip systems
We suggest that a larger value of GSFE0.3b-GSFE0.4b might increase the stability of the stacking fault on the {10-11} planes and promote the mobile transformation
To the best of our knowledge, there is no evidence that Bi, Pb and Sn can dramatically increase the ductility of magnesium alloys
Summary
Magnesium alloys show great potential for application in the automotive and aerospace industry. Dislocation could transform into a mobile structure as the following [19]: 1/3[11,12,13,14,15,16,17,18,19,20,21,22,23] → 1/6[20,21,22,23]+1/6[02-23] To this end, there must exist at least one stable stacking fault energy (SFE) on the {10-11} plane. Transformation is preferred in the observed [2].vice the {10-11} plane could cross slip onto the {11-22} We believe this discrepancy arises from the insufficient consideration of simulation modes.
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