Effect of Substituted Aluminum in Magnesium Tension Twin

Atomistic simulations are performed in order to study the Aluminum substitution effect on Magnesium twinning mechanism. Multiple twin boundaries are found in pure Mg single crystal under tensile loading condition along <math display='block'> <mrow> <mo stretchy='false'>(</mo><mover accent='true'> <mn>1</mn> <mo>&#x00AF;</mo> </mover> <mn>012</mn><mo stretchy='false'>)</mo> </mrow> </math>$$(\bar 1012)$$ crystallographic direction. However, no twinning has occurred under compression loading. Al substitution has been done for 2, 5, 7, and 10% doping. For 2 and 5% Al substitution, number of twins increase when the system is monitored under tensile loading. On the other hand, for 7 and 10% Al doping under tensile loading, no twin has been found. We found that dislocation-twin and dislocation-dislocation interaction are majorly responsible for this behavior and it is important that which one is prevalent.