Abstract
Ni40Ti50Cu10 foams were replication cast into a porous SrF2 preform. This space holder is chemically stable in contact with liquid and solid Ni40Ti50Cu10, but can be removed by dissolution in nitric acid. A Ni40Ti50Cu10 foam with 60 pct porosity exhibits low stiffness (1 to 13 GPa) and large recoverable strains (~4 pct) during cyclical compression testing at 311 K (38 °C), within the superelastic range based on calorimetry results. This is the first time that replication casting is used to create an open foam of a NiTi-based shape-memory alloy, due to difficulties associated with the high reactivity and strong contamination tendency of the melt. Casting NiTi-based shape-memory alloy foams enable the economical production of porous actuators, energy absorbers, and biomedical implants with complex shapes.
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Acknowledgments
The authors acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG) through Subproject C7 of the Collaborative Research Center SFB 459 (with additional funding from the German state of North Rhine-Westphalia and Ruhr-Universität Bochum). MLY also acknowledges support by the Alexander von Humboldt Foundation.
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Manuscript submitted May 19, 2011.
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Young, M.L., DeFouw, J.D., Frenzel, J. et al. Cast-Replicated NiTiCu Foams with Superelastic Properties. Metall Mater Trans A 43, 2939–2944 (2012). https://doi.org/10.1007/s11661-011-1060-x
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DOI: https://doi.org/10.1007/s11661-011-1060-x