ELECTRON-MICROSCOPY STUDIES OF MARTENSITE MICROSTRUCTURES

An overview will be given of some recent results of microstructural el ectron microscopy studies on martensitic systems. The precursor struct ure observed in a ternary Ni-Mn-Ti alloy and its correlation with the ensuing stacking sequence is presented. New types of materials of a we ll known alloy, in casu splat-cooled and nanoscale thin films of Ni Al are investigated revealing particular morphologies of the microtwin s tackings in the martensite. The complex microstructure with two marten site structures, multiple macro-and microtwinning and different out-of -phase type defects in CuZr is also discussed.