Martensitic Transformation and Mechanical Behavior of TiNi Shape Memory Alloys after Severe Plastic Deformation

Koichi Tsuchiya; M. Inuzuka; Akihide Hosokawa; Dacian Tomus; Hiroyuki Nakayama; K. Morii; Yoshikazu Todaka; Minoru Umemoto

doi:10.4028/www.scientific.net/MSF.503-504.419

Paper Titles

Application of High Pressure Torsion to Bulk Samples
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Specific Features of the Strengthening during Severe Plastic Deformation of Supersaturated Solid Solutions
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Differences in Structural Evolution in Single- and Dual-Phase Materials during Severe Plastic Deformation
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Formation of Supersaturated Solid Solutions in Al Alloys with Transition Metals Upon Shear under Pressure
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Martensitic Transformation and Mechanical Behavior of TiNi Shape Memory Alloys after Severe Plastic Deformation
p.419

New Routes for Synthesizing Massive Nanocrystalline Materials
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3D-Atom Probe Investigation of Vacancy Induced Interdiffusion during High Pressure Torsion Deformation
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A New Deformation Mechanism in Nanoscale Fe-C Composite as a Result of a Stress-Induced α→γ Transformation
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Ultrafine Grained Dual Phase Steels Fabricated by Equal Channel Angular Pressing
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HomeMaterials Science ForumMaterials Science Forum Vols. 503-504Martensitic Transformation and Mechanical Behavior...

Martensitic Transformation and Mechanical Behavior of TiNi Shape Memory Alloys after Severe Plastic Deformation

Abstract:

Thermal- and stress-induced martensitic transformation was investigated on TiNi shape memory alloys subjected to severe plastic deformation (SPD) by cold rolling. TEM observation revelaed the sample is a mixture of nanocrystalline and amorphous after 40% cold rolling. DSC analysis suggested that the martensitic transformation was suppressed when the thickness reduction was over 25% reduction. Aging at lower temperatures (573 ~ 673 K, 3.6 ks) restores the phase transformations, but to a limited extent. The stress-strain curves of nanocrystalline/amorphous TiNi are characterized by absence of stress-plateau and small hysteresis.