Microstructure and Superelasticity of Cu–Sn Shape-Memory Microwires by Glass-Coated Melt Spinning
Cu–Sn shape-memory microw ires were fabricated by a glass-coated melt spinning method. Effects of Sn content on the microstructure and mechanical properties of microwires were investigated. The phase transforms from martensite to austenite with an increase in Sn from 14.0 atomic percent (at.%) to 16...
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MDPI AG
2023-11-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/11/1852 |
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| author | Yangyong Zhao Yuanyuan Bai Tie Li Yong Zhang |
| author_facet | Yangyong Zhao Yuanyuan Bai Tie Li Yong Zhang |
| author_sort | Yangyong Zhao |
| collection | DOAJ |
| description | Cu–Sn shape-memory microw ires were fabricated by a glass-coated melt spinning method. Effects of Sn content on the microstructure and mechanical properties of microwires were investigated. The phase transforms from martensite to austenite with an increase in Sn from 14.0 atomic percent (at.%) to 16.5 at.%. When the Sn content exceeds 16.5 at.%, a highly ordered intermetallic phase, δ, formed. The fracture stress (<i>σ<sub>f</sub></i>) and the critical stress for martensitic transformation (<i>σ<sub>Ms</sub></i>) increases with an increase in Sn content. The mechanical properties as well as the superelasticity were greatly improved by a high cooling rate in the glass-coated melt spinning method. A bamboo-grained structure was formed in the Cu–Sn microwire with a Sn content of 16 at.% by annealing at 750 °C for 5 h before quenching in water. The results indicate that two opposite strategies of refining the grain size to the micrometer level, or increasing the grain size to a one dimensional size of specimen, e.g., the diameter of the wire, are both effective in improving the superelasticity of the Cu–Sn alloy. |
| first_indexed | 2024-03-09T16:37:24Z |
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| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T16:37:24Z |
| publishDate | 2023-11-01 |
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| spelling | doaj.art-a2a565992ef94067a4667bf5cb857f582023-11-24T14:55:51ZengMDPI AGMetals2075-47012023-11-011311185210.3390/met13111852Microstructure and Superelasticity of Cu–Sn Shape-Memory Microwires by Glass-Coated Melt SpinningYangyong Zhao0Yuanyuan Bai1Tie Li2Yong Zhang3State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, Chinai-Lab, Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), 398 Ruoshui Road, Suzhou 215123, Chinai-Lab, Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), 398 Ruoshui Road, Suzhou 215123, ChinaState Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, ChinaCu–Sn shape-memory microw ires were fabricated by a glass-coated melt spinning method. Effects of Sn content on the microstructure and mechanical properties of microwires were investigated. The phase transforms from martensite to austenite with an increase in Sn from 14.0 atomic percent (at.%) to 16.5 at.%. When the Sn content exceeds 16.5 at.%, a highly ordered intermetallic phase, δ, formed. The fracture stress (<i>σ<sub>f</sub></i>) and the critical stress for martensitic transformation (<i>σ<sub>Ms</sub></i>) increases with an increase in Sn content. The mechanical properties as well as the superelasticity were greatly improved by a high cooling rate in the glass-coated melt spinning method. A bamboo-grained structure was formed in the Cu–Sn microwire with a Sn content of 16 at.% by annealing at 750 °C for 5 h before quenching in water. The results indicate that two opposite strategies of refining the grain size to the micrometer level, or increasing the grain size to a one dimensional size of specimen, e.g., the diameter of the wire, are both effective in improving the superelasticity of the Cu–Sn alloy.https://www.mdpi.com/2075-4701/13/11/1852shape memory alloyglass-coated microwireCu–Sn alloysuperelastic effectbamboo-like grained structure |
| spellingShingle | Yangyong Zhao Yuanyuan Bai Tie Li Yong Zhang Microstructure and Superelasticity of Cu–Sn Shape-Memory Microwires by Glass-Coated Melt Spinning Metals shape memory alloy glass-coated microwire Cu–Sn alloy superelastic effect bamboo-like grained structure |
| title | Microstructure and Superelasticity of Cu–Sn Shape-Memory Microwires by Glass-Coated Melt Spinning |
| title_full | Microstructure and Superelasticity of Cu–Sn Shape-Memory Microwires by Glass-Coated Melt Spinning |
| title_fullStr | Microstructure and Superelasticity of Cu–Sn Shape-Memory Microwires by Glass-Coated Melt Spinning |
| title_full_unstemmed | Microstructure and Superelasticity of Cu–Sn Shape-Memory Microwires by Glass-Coated Melt Spinning |
| title_short | Microstructure and Superelasticity of Cu–Sn Shape-Memory Microwires by Glass-Coated Melt Spinning |
| title_sort | microstructure and superelasticity of cu sn shape memory microwires by glass coated melt spinning |
| topic | shape memory alloy glass-coated microwire Cu–Sn alloy superelastic effect bamboo-like grained structure |
| url | https://www.mdpi.com/2075-4701/13/11/1852 |
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