Superelastic ferroelectric micropillar with large hysteresis and super-durability

Chu, Kangjie1,2,5; Li, Yingwei1,3,4; Wang, Xiaomei1; Wu, Zhijun1; Peng, Qi1; Li, Jiangyu2,3; Chen, Long-Qing6; Ren, Fuzeng2; Sun, Qingping5

2023-10-01

10.1016/j.actamat.2023.119140

ACTA MATERIALIA   Impact Factor & Quartile

1359-6454

1873-2453

Hysteresis and durability are generally on the opposite sides of a trade-off for superelastic materials. We herein break this trade-off and report that BaTiO3 (BT) micropillars present size-dependent superelasticity and possess simultaneous large hysteresis and super-durability, sustaining up to 108 superelastic cycles without functional degradation and structural failure. TEM results reveal that the as-fabricated BT pillars are composed of inner BT crystal part and surface BT amorphous layer. In addition, it is found that after high temperature annealing, the BT pillar with cross sectional side length d of 2 & mu;m loses superelasticity. Based on these results, a model was developed to explain the size dependent behavior of BT pillars by considering the constitutive behavior difference of BT crystal and BT in amorphous phase, and their interaction during compressive stress loading and unloading. The super-durability was attributed to the small ferroelastic switching stress, which are much smaller than the dislocation nucleation activation stress and the compression strength of BT pillars, and the moderate mismatch stress between different ferroelectric variants as well as the stress relaxation by the high surface area of the small volume BT pillar. These discoveries enable ferroelectric micropillars many promising applications such as microdampers, and also provide significant insight into developing superelastic materials with enhanced durability.

Ferroelectrics Hysteresis Durability Micropillar Ferroelastic switching

SCI

English

Corresponding

National Natural Science Foundation of China["12272275","12192213","52122102","2021B1212040001"] ; Guangdong Provincial Key Laboratory Program[JCYJ20220530113017040] ; null[11972262]

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:001060393800001

PERGAMON-ELSEVIER SCIENCE LTD

MATERIALS SCIENCE

Web of Science

1.Wuhan Univ, Sch Civil Engn, Wuhan 430072, Hubei, Peoples R China
2.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
3.Southern Univ Sci & Technol, Guangdong Prov Key Lab Funct Oxide Mat & Devices, Shenzhen 518055, Guangdong, Peoples R China
4.Ningbo Univ, Fac Mech Engn & Mech, Ningbo 315211, Peoples R China
5.Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Clear Water Bay, Hong Kong, Peoples R China
6.Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

Chu, Kangjie,Li, Yingwei,Wang, Xiaomei,et al. Superelastic ferroelectric micropillar with large hysteresis and super-durability[J]. ACTA MATERIALIA,2023,258.

Chu, Kangjie.,Li, Yingwei.,Wang, Xiaomei.,Wu, Zhijun.,Peng, Qi.,...&Sun, Qingping.(2023).Superelastic ferroelectric micropillar with large hysteresis and super-durability.ACTA MATERIALIA,258.

Chu, Kangjie,et al."Superelastic ferroelectric micropillar with large hysteresis and super-durability".ACTA MATERIALIA 258(2023).