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The transformation hysteresis and stability of strain martensite in Ni_(47)Ti_(44)Nb_(?) alloy havebeen studied by means of tensile tests at various temperatures and electrical resistancemeasurements as well as TEM observations.It was shown that there is a characteristicdeformation temperature and a strain range,in which the critical yield stress for stress-in-duced transformation acquires optimum matching with the yield strength of the β-Nb parti-cles.In this case,deformatian can effectively increase the transformation hysteresis,while thestrain recovery ratio remains usefully high.The martensite with irreguldar fine.twinsubstructure and martensite containing some dislocations as well as martensite intersected bythe β-Nb particles possess high stability.
The transformation hysteresis and stability of strain martensite in Ni_ (47) Ti_ (44) Nb_ (?) Alloy have been studied by means of tensile tests at various temperatures and electrical resistance measurements as well as TEM observations. It was shown that there is a characteristic formation temperature and a strain range in which the critical yield stress for stress-in-duced transformation allows optimum matching with the yield strength of the β-Nb parti-cles. In this case, deformatian can effectively increase the transformation hysteresis, while the strain recovery ratio remains usefully high. the martensite with irreguldar fine. twinsubstructure and martensite containing some dislocations as well as martensite intersected bythe β-Nb particles possess high stability.