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The banded martensite (β′) in a quenched Cu–Sn alloy containing 24. 5 wt%Sn has been studied by transmission electron microscopy. It is concluded from the diffraction patterns that β′ has an orthorhombic close-packed lattice of AB′AC′ type. In the elctron microgragh, striations parallel to the (122) plane are found. These striations and the elongation of diffraction spots perpendicular to them show the existence of stacking faults (spacing about 100Å) due to the martensite transformation. The orientation relationships between the β′ martensite and the parent β1-phase are (001) β⁄⁄ (110) β1, 210β′⁄⁄111β1, the habit plane of the β′ martensite plate being near (223) β1.
Nishiyama et al. (Mon,) studied this question.