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Updated: Nov 2, 2025
Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
Published on: July 28, 2020
Superelastic oxide micropillars enabled by surface tension-modulated 90° domain switching with excellent fatigue
Yingwei Li1,2,3,4, Kangjie Chu5,6, Chang Liu7,8
1School of Civil Engineering, Wuhan University, 430072 Wuhan, Hubei, China; yingweili@whu.edu.cn jw@zju.edu.cn renfz@sustech.edu.cn lijy@sustech.edu.cn.
Abstract:
Superelastic materials capable of recovering large nonlinear strains are ideal for a variety of applications in morphing structures, reconfigurable systems, and robots. However, making oxide materials superelastic has been a long-standing challenge due to their intrinsic brittleness. Here, we fabricate ferroelectric BaTiO3 (BTO) micropillars that not only are superelastic but also possess excellent fatigue resistance, lasting over 1 million cycles without accumulating residual strains or noticeable variation in stress-strain curves. Phase field simulations reveal that the large recoverable strains of BTO micropillars arise from surface tension-modulated 90° domain switching and thus are size dependent, while the small energy barrier and ultralow energy dissipation are responsible for their unprecedented cyclic stability among superelastic materials. This work demonstrates a general strategy to realize superelastic and fatigue-resistant domain switching in ferroelectric oxides for many potential applications.
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