Effects of Sn Addition on NiTi Shape Memory Alloys
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NiTiSn shape memory alloys provide a cost-effective alternative to many NiTi-based low-temperature shape memory alloy systems such as NiTi: Cr, Co, and Nb. To demonstrate the viability of NiTiSn shape memory alloys for low-temperature actuator applications, the NiTiSn alloy system was investigated over the course of four alloy heats (Heats I–IV). The site preference of Sn in near-equiatomic NiTi was examined by substituting Sn for Ni in Heat I and Sn for Ti in Heat II up to 10 at.% Sn. The effects of solution annealing (Heat III) and Ni:Ti ratio adjustments (Heat IV) on the phase transformation behavior and microstructural morphology of NiTiSn shape memory alloys were also assessed.
KeywordsShape memory Low temperature NiTiSn
The authors thank the Consortium for the Advancement of Shape Memory Alloy Research and Technology (CASMART). This research was a direct result of the CASMART Student Design Challenge at the International Conference on Shape Memory and Superelastic Technologies (SMST 2017) . The authors acknowledge the permission for SEM access by the UNT’s Materials Research Facility (MRF), and thank D. Scheiman for DSC characterization.
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