Martensite structure in polycrystalline Fe–Pd

The martensite structure in polycrystalline Fe–Pd has been examined from a mechanics and a crystallographic point of view. The structure consists of dark and bright plates, parallel to {110}, which, under no stress, exist in an equal amount. A plate has a fine structure, in which a set of twin-related variants adjoining on {110} interfaces is stacked together. That is, the dark plate contains two twin-related variants as does the bright plate. One variant in the bright plate is the same as one in the dark. The others are twin-related. In total, a grain is covered by equal amounts of three variants when transformation is completed. Straining caused by uniaxial loading is evaluated.