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Phase transformation behavior and mechanical properties of Ti50Ni49−x Fe1Co x shape memory alloys

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Abstract

In this article, the influence of Co addition on phase transformation behavior and mechanical properties of TiNiFe shape memory alloy was investigated extensively. Differential scanning calorimetry (DSC) measurements shows that martensitic start transformation temperatures (M s) decrease drastically with increasing Co content, while the R phase transformation start temperatures (R s) vary slightly. Nevertheless, the substitution of Ni with Co does not exert substantial influence on the two-stage transformation behavior of the TiNiFe alloy. The results from stress–strain curves indicate that higher critical stress for stress-induced martensitic transformation (σ SIM) has been obtained because of Co addition. In such cases, the Ti50Ni48Fe1Co1.0 alloy maintains a good shape memory effect, and a maximum recoverable strain of 7.5 % can be obtained.

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Acknowledgment

This project was financially supported by the National Natural Science Foundation of China (No. 50921003) and the Industry, Education and Research Projects of the China Aviation Industrial (No.cxy2012BH04).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100191, China

    Bin Chen & Fu-Shun Liu

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  1. Bin Chen
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  2. Fu-Shun Liu
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Correspondence to Fu-Shun Liu.

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Chen, B., Liu, FS. Phase transformation behavior and mechanical properties of Ti50Ni49−x Fe1Co x shape memory alloys. Rare Met. 32, 225–227 (2013). https://doi.org/10.1007/s12598-013-0073-6

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  • DOI: https://doi.org/10.1007/s12598-013-0073-6

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