Abstract
This work investigates the activation of 101̅1-(101̅2) double twins (DT) in the fatigue pre-cracked tip vicinity during fracture toughness tests in magnesium. Primarily, among the six {101̅1}101̅2 contraction twin (CT) variants, the high Schmid factor (SF) ones evolved by ∼56° lattice rotation about a specific 2̅110 axis. Within the CT domain, only two among the six {101̅2}101̅1 extension twins (ET) variants evolved with the same 2̅110 rotation axis as their primary CT, irrespective of their SF. Among these two ETs, the one with the highest SF evolved. The ET within CT with the same or opposite ∼86.4° lattice rotation about 2̅110 axis creates DT with ∼38°2̅110 i.e., Σ23b and ∼30°2̅110 i.e., Σ15a coincident site lattice boundaries, respectively.
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