Structure of tetragonal martensite in the In$_{95.42}$Cd$_{4.58}$ cast alloy

The structure of martensite in the In$_{95.42}$Cd$_{4.58}$ alloy has been studied by metallography, X-ray diffraction, dilatometry, and transmission electron microscopy. It has been shown that a massive structure built of colonies of tetragonal lamellar plates divided by a twin boundary $\{101\}_\mathrm{FCT}$ is formed in the alloy under cooling below the martensite FCC $\to$ FCT transition temperature. The alloy recrystallizes after a cycle of FCT $\to$ FCC $\to$ FCT transitions with a decrease in the grain size by several times compared with the initial structure such fashion that the size of massifs and individual martensite lamella in the massif correlates with the change in the size of the alloy grain. Using thermal cycling, it has been revealed that the alloy tends to stabilize the high-temperature phase.