Nonlocal linear instability via vanishing Hessian eigenvalue initiates twin boundary motion in a 2D lattice model, with irrational boundaries starting at lower shear stresses and sometimes forming orthogonal microtwins.
The square austenitic lattice (left) is transformed into a twinned rectangular martensitic lattice (right), with the coherent twin bounmdaries shown in gray
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Nonlocal Linear Instability Drives the Initiation of Motion of Rational and Irrational Twin Interfaces
Nonlocal linear instability via vanishing Hessian eigenvalue initiates twin boundary motion in a 2D lattice model, with irrational boundaries starting at lower shear stresses and sometimes forming orthogonal microtwins.