Martensite structures in shape memory β phase alloys

The aim of this work was to analyse the crystal structure of different types of long period martensites. A new stacking sequences: (1 (1) over bar1)(2) for the 6M, ((1) over bar5 (1) over bar)(2) for the 14M and ((1) over bar3 (1) over bar)(2) for the 10M martensite have been proposed, which in practice are equivalent to the change of the choice of the unit cell; for these stacking sequences a correct atomic symmetry is achieved. The observed intermediate modulated 10M type structure confirms the modulated structure approach in this case.