Strain-rate effects on TiNi and TiNiCu shape memory alloys

Hiroyuki Nakayama; Ying Zhao; Minoru Taya; Weinong W. Chen; Yuta Urushiyama; Shunji Suzuki

doi:10.1117/12.600084

16 May 2005 Strain-rate effects on TiNi and TiNiCu shape memory alloys

Hiroyuki Nakayama, Ying Zhao, Minoru Taya, Weinong W. Chen, Yuta Urushiyama, Shunji Suzuki

Proceedings Volume 5761, Smart Structures and Materials 2005: Active Materials: Behavior and Mechanics; (2005) https://doi.org/10.1117/12.600084
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2005, San Diego, California, United States

Abstract

Dynamic deformation behavior of TiNi (superelastic grade) and TiNiCu alloy (shape memory grade) were examined using Split Hopkinson Pressure Bar. The stress-strain curves of the TiNi alloy exibits strain rate sensitivity. The flow stress in the plateau region increased with increasing of strain rate logarithmically, and the on-set stress for stress induced martensite also increased slightly. In contrast, the stress-strain curve of the TiNiCu alloy was found to be much less sensitive to strain rate. TEM observations revealed that the microstructure of the dynamically deformed TiNi is similar to that of the sample before dynamic deformation. In contrast, the dynamically deformed TiNiCu has a fine twinned structure than the sample deformed statically. Analytical constitutive equation for the dynamic deformed TiNi alloy was proposed by addition of the terms concerning the strain rate effect and temperature change due to adiabatic deformation and latent heat of martensitic transformation, the revised constitutive equation was in a good agreement with the experimental results.

Citation Download Citation

Hiroyuki Nakayama, Ying Zhao, Minoru Taya, Weinong W. Chen, Yuta Urushiyama, and Shunji Suzuki "Strain-rate effects on TiNi and TiNiCu shape memory alloys", Proc. SPIE 5761, Smart Structures and Materials 2005: Active Materials: Behavior and Mechanics, (16 May 2005); https://doi.org/10.1117/12.600084

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