Abstract
In the present study, in-situ observation of preparatory untwinning during reverse martensitic transition in an In-22.5at%Tl alloy is discussed. It is for the first time that the phenomenon of preparatory untwinning is being reported in SMAs. It forms an important observation, and its origins are explored which helps shed light on the mechanism of reverse martensitic transitions, and gives insight into the phenomenon of shape memory effect. Shear stresses arise on the twin-planes of the face-centered tetragonal (FCT) phase due to thermoelastic coupling, giving rise to preparatory untwinning in reverse martensitic transition in an In-22.5at%Tl SMA. Due to pretransition C{prime} elastic softening, the shear modulus on twin systems almost approaches zero, causing preparatory untwinning to occur spontaneously. The shear stresses arising due to pretransition thermoelastic coupling are not precluded by Neumann`s principle, and the entropy generated due to this coupling appears at new main-bands.
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