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Fundamentals of Engineering Plasticity by William F.,Hosford

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11 Mechanical Twinning and Martensitic Shear

Twinning

Many crystalline materials can deform by twinning as well as by slip. Mechanical twinning, like slip, occurs by shear. A twin is a region of a crystal in which the orientation of the lattice is a mirror image of that in the rest of the crystal. Twins may form during recrystallization (annealing twins), but the concern here is formation of twins by uniform shearing (mechanical twinning) as illustrated in Figure 11.1. In this figure, plane 1 undergoes a shear displacement relative to plane 0 (the mirror plane). Then, plane 2 undergoes the same shear relative to plane 1, and plane 3 relative to plane 2, and so on. The net effect of the shear between each successive plane is to reproduce the lattice, ...

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