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Deformation Behavior of Functionally Graded Ti-Ni Shape Memory Alloys

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Abstract:

Deformation behavior of temperature gradient anneal(TGA) treated Ti-50.0Ni(at%) alloys were investigated by means of thermal cycling tests under constant load and tensile tests. TGA treated Ti-Ni alloy wires showed a sequential deformation behavior along the length of the specimen since the stress required for the B2-B19’ transformation increased with decreasing annealing temperature. Considerably large residual elongation(about 0.4 %) occurred in the TGA treated Ti-Ni alloy under the applied stress of 80 MPa, which is ascribed to the fact that yield stress of the sample annealed at 823 K is lower than the stress required for the B2-B19’ transformation of the sample annealed at 658 K.

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Periodical:

Materials Science Forum (Volumes 544-545)

Pages:

211-214

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.544-545.211

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Online since:

May 2007

Authors:

Tae Hyun Nam, Hyun Gon Kim, Ju Young Choi, Jung Moo Lee, Suk Bong Kang, Cha Yong Lim

Keywords:

Cold Rolling, Plastic Deformation, Stress-Induced Martensitic Transformation, Temperature Gradient Annealing, Ti-Ni Alloy

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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