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- Title
Ferroelastic oligocrystalline microwire with unprecedented high-temperature superelastic and shape memory effects.
- Authors
Chen, Zhen; Cong, Daoyong; Ren, Yang; Zhang, Yin; Yan, Haile; You, Li; Song, Chao; Li, Shaohui; Cao, Yuxian; Li, Shengwei; Zuo, Changchang; Wang, Li; Gao, Zhiyong; Cai, Wei; Wang, Yandong
- Abstract
A compelling demand exists for high-performance high-temperature shape memory alloys (HTSMAs) that can be applied as intelligent components in the rapidly developing aerospace, robotics, manufacturing, and energy exploration industries. However, existing HTSMAs are handicapped by their high cost and unsatisfactory functional properties, which impede their practical application. Here, by using the strategy of creating an oligocrystalline structure, we have developed a high-performance, cost-effective high-temperature shape memory microwire exhibiting an exceptional combination of superb superelasticity with a large recoverable strain of up to 15%, an outstanding one-way shape memory effect with a maximum recoverable strain as high as 13% and a remarkable two-way shape memory effect with a large recoverable strain of 6.3%. These unparalleled comprehensive properties provide this microwire with a high potential for use in high-temperature actuation, sensing, and energy conversion applications, especially in miniature intelligent devices, such as high-temperature microelectromechanical systems. The present strategy may be universally applicable to other brittle phase-transforming alloys for achieving outstanding functional properties at high temperatures.Shape-memory alloys: Controlling crystal size increases elasticity Improved fabrication of temperature-sensitive alloys that snap back to their original shapes after being deformed can promote their use as sensors and actuators. Shape-memory alloys are often composed of precious metals such as platinum and can become brittle after extended use at high temperatures. An international team led by Daoyong Cong at the University of Science and Technology Beijing, China, now report a technique for constructing robust shape-memory alloys from low-cost metals. The team’s approach uses controlled quenching and drawing to produce nickel–manganese–iron–gallium microwires with large crystal grain sizes. Because each crystal grain spans the cross-section of the microwire, the alloys feature fewer points where stress fractures are likely to occur during shape transformations. The microwires demonstrated recoverable strain values nearly triple that of platinum-based alloys at temperatures up to 500 °C.A high-performance, cost-effective high-temperature intelligent microwire with exceptional combination of superb superelasticity, outstanding one-way shape memory effect, and remarkable two-way shape memory effect is designed with the concept of creating oligocrystalline structure with bamboo-like grains. This microwire shows tremendous potential for applications as intelligent components at elevated temperatures, especially in miniature devices, such as high-temperature microelectromechanical systems.
- Publication
NPG Asia Materials, 2022, Vol 14, Issue 1, p1
- ISSN
1884-4049
- Publication type
Article
- DOI
10.1038/s41427-022-00367-7