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Remarkable Improvement of Shape-Memory Effect in a Co-31Ni-3Si Alloy by Ausforming

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Abstract

In order to improve the shape-memory effect (SME) in Co-Ni alloys, the influence of ausforming temperature on the SME, microstructures, and mechanical behavior in a Co-31Ni-3Si alloy was studied. The results show that the ausforming at 1073 K (800 °C) could remarkably improve the SME in Co-31Ni-3Si alloy. A large recovery strain of 2.3 pct was obtained after bent by 3.7 pct at 77 K (−196 °C). The increase of yield strength and the decrease of the critical stress for the stress-induced gamma to epsilon martensitc transformation are responsible for the remarkable improvement of SME. The results indirectly showed that the SME in Co-Ni alloys results from the stress-induced gamma to epsilon martensitic transformation, and their low yield strength account for their poor SME. It can be expected that the strengthening of matrix by other methods, such as solution, dispersion, and grain refinement hardening, will improve the SME of Co-Ni alloys.

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Acknowledgments

The work was supported by the National Natural Science Foundation of China (No. 50971095, 51171123 and 51271128) and the Natural Science Foundation for Young Scientists of Sichuan Province in China (No. 2010A01-436).

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Authors and Affiliations

  1. College of Manufacturing Science and Engineering, Sichuan University, Chengdu, 610065, P.R. China

    Jiangwei Sun (Postgraduate Student), Zhiwei Yan (Postgraduate Student), Huabei Peng (Lecturer) & Yuhua Wen (Professor)

  2. Analytical &Testing Center, Sichuan University, Chengdu, 610065, P.R. China

    Shanling Wang (Professor)

Authors
  1. Jiangwei Sun
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  2. Shanling Wang
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  3. Zhiwei Yan
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  4. Huabei Peng
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  5. Yuhua Wen
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Correspondence to Yuhua Wen.

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Manuscript submitted October 8, 2014.

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Sun, J., Wang, S., Yan, Z. et al. Remarkable Improvement of Shape-Memory Effect in a Co-31Ni-3Si Alloy by Ausforming. Metall Mater Trans A 46, 1550–1555 (2015). https://doi.org/10.1007/s11661-015-2761-3

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