Twin boundary migration creating zero shear strain: In-situ TEM observations and atomistic simulations

Atomic displacements accompanying deformation twinning: shears and shuffles

“…[11] In a series of recent papers, it has been claimed that the (1012) 1 011 mode is 'non-classical' on the grounds that shuffling 'dominates' shear to such an extent that no shear strain is observed in microscopic specimens. [12][13][14][15] This contention has been criticised elsewhere, [16][17][18] and is clearly not supported by Table 1, where it is seen that the values of |s i /b 2 | for atoms 1-4 in Zr are 1.41, 1.85, 0.86 and 2.21. Moreover, although the twinning shear strain for Zr is relatively small, γ = |b 2 |/h 2 = 0.165, active modes are known with smaller magnitudes than this in other materials.…”