High damping NiTi/Ti3Sn in situ composite with transformation-mediated plasticity

Junsong Zhang, Yinong Liu, Y. Huan, S. Hao, D. Jiang, Y. Ren, Y. Shao, Y. Ru, Z. Wang, L. Cui

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© 2014 Elsevier Ltd. The concept of transformation-induced plasticity effect is introduced in this work to improve the plasticity of brittle intermetallic compound Ti3Sn, which is a potent high damping material. This concept is achieved in an in situ NiTi/Ti3Sn composite. The composite is composed of primary Ti3Sn phase and (NiTi+Ti3Sn) eutectic structure formed via hypereutectic solidification. The composite exhibits a high damping capacity of 0.075 (indexed by tanδ), a high ultimate compressive strength of 1350MPa, and a large plasticity of 27.5%. In situ synchrotron high-energy X-ray diffraction measurements revealed clear evidence of the stress-induced martensitic transformation (B2→B19') of the NiTi component during deformation. The strength of the composite mainly stems from the Ti3Sn, whereas the NiTi component is responsible for the excellent plasticity of the composite.
Original languageEnglish
Pages (from-to)460-463
Number of pages4
JournalMaterials and Design
Early online date6 Jun 2014
Publication statusPublished - Nov 2014

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