STRUCTURAL TRANSFORMATIONS IN NITI, A POTENTIAL MATERIAL FOR HYDROGENSTORAGE

NiTi, a shape memory alloy, was analysed by neutron diffraction powder technique, and its reversible displacive transformations were checked for their long range ordering behaviour. These transformations were c ontrolled by other techniques as DSC, resistivity, and microanalysis. The cubic structured material was successfully hydrided by applying ei ther an electrochemical procedure or H-2 gas pressure under moderate c onditions. The premartensite microstructure could play a favourable ro le on the hydridation reaction.