Abstract
Conventional (1011) twinning in hexagonal metals has the twin plane K1 = (1011) and the corresponding twinning direction η1=[1012]. Twinning shear is generally accomplished through the gliding of two-layer and/or four-layer twinning dislocations (TDs) along η1 associated with atomic shuffles. Using molecular dynamics simulations, we reveal that an unusual shear along -η1 associated with atomic shuffles on the twin plane K1 is resulted by gliding of a one-layer TD. Correspondingly, an unconventional {1011} twinning occurs through successive gliding of one-layer TDs. Such a twinning mechanism is found to be correlated to high stress/strain concentration, such as at crack tip.
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