Effect of plastic deformation on material properties and martensite structures in Ti-Nb alloys

► Young's modulus decreased with plastic deformation in both α′ and α″ martensite. ► The internal friction increased drastically at a weak plastic deformation of the α″ martensite. ► The changes in the α′ martensite were affected by reverse transformation or emission of a dislocation. ► The changes in the α″ martensite were affected by the change in the internal microstructure.