Abstract
It is shown that in addition to the heretofore accepted homogeneous (simple) shear model, there is yet another mechanism that is inhomogeneous which can bring about mechanical twins in an A2(bcc) structure. In martensitic transformations where the cause for transformation is primarily internal, inhomogeneous‐but‐cooperative shear may take place in preference to homogeneous shear. Application of the inhomogeneous‐but‐cooperative shear model to a B2(CsCl)‐type structure leads to a triclinic structure. In the course of this structural transformation, two modes of transformation twinning and one mode of trilling are possible.

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