期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.01.110
关键词
nanocrystalline materials; amorphization; martensitic transformation; superelasticity; cold rolling
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. (c) 2006 Elsevier B.V. All rights reserved.
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