Temperature dependence of incomplete martensitic transformation and elastocaloric properties of superelastic NiTi: Experiment and phase-field simulation

doi:10.1016/j.jmst.2024.11.052

IMR OpenIR

	Temperature dependence of incomplete martensitic transformation and elastocaloric properties of superelastic NiTi: Experiment and phase-field simulation
	Chen, Junyu 1,2; Zhang, Qi 1; Wei, Boxin 2,3; Wang, Wenqiang 1; Zhang, Wenjing 4; Lei, Liping 1; Ramamurty, Upadrasta 2; Fang, Gang 1
通讯作者	Fang, Gang(fangg@tsinghua.edu.cn)
	2025-08-10
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	226 页码:158-171
摘要	Partial phase transformation in NiTi-based refrigerants usually enables efficient and durable elastocaloric cooling, but its thermomechanical behavior with varying temperatures remains unclear. Keeping this in view, the elastocaloric effect of NiTi under incomplete transformation across 15-100 degrees C is investigated and a superelastic deformation window between 25 and 85 degrees C is identified. Synchronous infrared thermography and digital image correlation, and an innovative macro-micro phase-field model are employed to examine martensitic transformation and elastocaloric properties of NiTi within the superelastic window. Experimental and simulated results consistently reveal that the spatiotemporal thermal profiles correlate with L & uuml;ders strain band evolution. As superelastic deformation temperature increases, strain localization intensifies, with L & uuml;ders bands favoring an inward strain growth over an outward expansion, resulting in a smaller yet more deformed martensitic transformation zone. The aggravated strain inhomogeneity makes the local endothermic undercooling tested at 85 degrees C up to about twice (-30.05 degrees C) that at 25 degrees C (-15.32 degrees C), boosting the global cooling capacity by 65 %, despite constant strain. The seeming contradiction between the larger elastocaloric effect and the narrower apparent martensitic transformation zone is elucidated by recourse to the simulations. It is found that the martensitic transformation within the L & uuml;ders bands is incomplete, proceeding in a macroscopically uniform but microscopically heterogeneous manner. Elevated temperatures within the superelastic window increase the transformed volume fraction and enhance martensitic transformation, thereby strengthening the global caloric effect. The work sheds light on the interplay between partial martensitic transformation and thermal behavior in NiTi under varying superelastic deformation temperatures, providing insights for advanced elastocaloric cooling applications. (c) 2025 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	Shape memory alloy Phase transformation Elastocaloric cooling Temperature dependence Phase-field simulation
资助者	National Key Research and Development Program of China ; Agency for Science, Technology and Research (A lowast; STAR) of Singapore
DOI	10.1016/j.jmst.2024.11.052
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2017YFB0701801] ; Agency for Science, Technology and Research (A lowast; STAR) of Singapore[A18B1b0061]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001409943700001
出版者	ELSEVIER
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/180520
专题	中国科学院金属研究所
通讯作者	Fang, Gang
作者单位	1.Tsinghua Univ, Dept Mech Engn, State Key Lab Clean & Efficient Turbomachinery Pow, Beijing 100084, Peoples R China 2.Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore 3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 4.Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China
推荐引用方式 GB/T 7714	Chen, Junyu,Zhang, Qi,Wei, Boxin,et al. Temperature dependence of incomplete martensitic transformation and elastocaloric properties of superelastic NiTi: Experiment and phase-field simulation[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2025,226:158-171.
APA	Chen, Junyu.,Zhang, Qi.,Wei, Boxin.,Wang, Wenqiang.,Zhang, Wenjing.,...&Fang, Gang.(2025).Temperature dependence of incomplete martensitic transformation and elastocaloric properties of superelastic NiTi: Experiment and phase-field simulation.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,226,158-171.
MLA	Chen, Junyu,et al."Temperature dependence of incomplete martensitic transformation and elastocaloric properties of superelastic NiTi: Experiment and phase-field simulation".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 226(2025):158-171.