MICROSTRUCTURE OF MARTENSITE IN Cu-14Al-4Ni ALLOY AGED FOR A PROLONGED TIME AT ROOM TEMPERATURE

The microstrueture in shape memory alloy Cu—14Al—4Ni aged for two years at room temper-ature has been studied,and the substructure slow change has been observed.The domains ofhighly ordered phase and the transition regions appear at grain boundaries,the twin bounda-ries damage.Furthermore,the microstructure also gives the appearance and growth ofantiphase domains like rectangular network.The long period antiphuse boundary structuresand the antiphase domains have bee.observed first at the single diffracted vector .The con-centration gradient of solute atom Al has heen found from the matrixes to the grain bounda-ries,the matrixe is poor in Al and the grain boundaries are rich in Al.