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In single crystals of an easy‐glide orientation of the heterogeneous alloys Cu‐15% Al‐2% Co (at %) with non‐coherent particles of CoAl the plastic deformation is shown to be realised by means of mechanical twinning and the dependence is investigated. At 77 K abnormally large reversible deformation (ε ≈︁ 2.5%) (superelasticity) associated with elastic twinning is found on unloading. The dependence of superelasticity effects on the particle dispersion, the test temperature, and crystal axis orientation is studied.

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