ON SECONDARY VARIANTS FORMED AT INTERSECTIONS OF EPSILON MARTENSITE VARIANTS

Crystallographic analysis and TEM observations on the orientation relationships of various epsilon martensite variants have been carried out in connection with their basal plane rotations Some new variants, which do not originate directly from the matrix by the well-known {111}[112BAR] simple shear process for the f.c.c. to h.c.p. transformation, have been observed and distinguished as secondary variants. Formation mechanisms of these variants have been Proposed based on the intersecting shears associated with intersecting initial variants. These successfully interpret the microstructural features of various variants and their intervariant relationships.