Author/Authors :
Tsuchiya، نويسنده , , K. and Inuzuka، نويسنده , , M. and Tomus، نويسنده , , D. and Hosokawa، نويسنده , , A. and Nakayama، نويسنده , , H. and Morii، نويسنده , , K. and Todaka، نويسنده , , Y. and Umemoto، نويسنده , , M.، نويسنده ,
Abstract :
Martensitic transformation and mechanical behavior was investigated on TiNi shape memory alloy subjected to severe plastic deformation by cold rolling. Transmission electron microscopy revealed the sample to be a mixture of nanocrystalline and amorphous material after 40% cold rolling. Diffrential scaning calorimetry measurements and X-ray diffractometry suggested that the martensitic transformation was suppressed when the thickness reduction was over 25%. The pseudoelastic stress–strain curves of nanocrystalline/amorphous TiNi are characterized by the absence of a stress-plateau and by small hysteresis.
Keywords :
Martensitic transformation , cold rolling , Nanocrystalline materials , amorphization , superelasticity
