SAED AND HREM RESULTS SUGGEST A NITI B19' BASED SUPERSTRUCTURE FOR CUZR MARTENSITE

The martensitic phases in stoichiometric CuZr have been investigated b y SAED and HREM. Detailed diffraction tilt series reveal a superstruct ure of the B19' (NiTi type) unit cell to be the major phase which also exhibits multiple microtwinning within one martensite plate. In some plates evidence for the basic B19' structure is found. From HREM a con firmation of the unit cell symmetry and dimensions for the superstruct ure was obtained and a suggestion for the type of shuffles yielding th e superstructure could be given.