文献类型：期刊文献

英文题名：Hydrogen-induced functional degradation in martensitic NiTi shape memory alloy wires under electrical actuation

作者：Wang, Jing Zuo, Shungui Sun, Guoqing Li, Xiang Wang, Zhihao Kong, Haijuan Xiao, Fei Khedr, Mahmoud

第一作者：Wang, Jing

通信作者：Zuo, SG[1];Zuo, SG[2];Zuo, SG[3];Khedr, M[4];Khedr, M[5];Khedr, M[6]

机构：[1]Shanghai Univ Engn Sci, Sch Mat Sci & Engn, Shanghai 201620, Peoples R China;[2]Hefei Univ Technol, Sch Chem & Chem Engn, Hefei 230009, Peoples R China;[3]Anhui Haoyuan Chem Grp Co Ltd, Fuyang 236056, Peoples R China;[4]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Guizhou, Peoples R China;[5]Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composite, 800 Dong Chuan Rd, Shanghai 200240, Peoples R China;[6]Benha Univ, Fac Engn Shoubra, Mech Engn Dept, Cairo 11629, Egypt;[7]Univ Oulu, Kerttu Saalasti Inst, Future Mfg Technol FMT, Pajatie 5, FI-85500 Nivala, Finland;[8]Lappeenranta Lahti Univ Technol, Sch Energy Syst, Mech Engn Dept, Laser Proc & Addit Mfg, POB 20, FI-53851 Lappeenranta, Finland

第一机构：Shanghai Univ Engn Sci, Sch Mat Sci & Engn, Shanghai 201620, Peoples R China

通信机构：corresponding author), Shanghai Univ Engn Sci, Sch Mat Sci & Engn, Shanghai 201620, Peoples R China;corresponding author), Hefei Univ Technol, Sch Chem & Chem Engn, Hefei 230009, Peoples R China;corresponding author), Anhui Haoyuan Chem Grp Co Ltd, Fuyang 236056, Peoples R China;corresponding author), Benha Univ, Fac Engn Shoubra, Mech Engn Dept, Cairo 11629, Egypt;corresponding author), Univ Oulu, Kerttu Saalasti Inst, Future Mfg Technol FMT, Pajatie 5, FI-85500 Nivala, Finland;corresponding author), Lappeenranta Lahti Univ Technol, Sch Energy Syst, Mech Engn Dept, Laser Proc & Addit Mfg, POB 20, FI-53851 Lappeenranta, Finland.

年份：2025

卷号：34

期号：11

外文期刊名：SMART MATERIALS AND STRUCTURES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001613944900001)】；

基金：This paper was supported by the National Natural Science Foundation of China (No. 52031005) and the Class III Peak Discipline of Shanghai-Materials Science and Engineering (High-Energy Beam Intelligent Processing and Green Manufacturing).

语种：英文

外文关键词：hydrogen embrittlement; shape memory alloy; NiTi; martensitic transformation; electrical actuation; mechanical behavior

摘要：Understanding the impact of hydrogen on martensitic NiTi shape memory alloy (SMA) wires is critical for ensuring the reliability of SMA-based actuators in hydrogen-rich environments. This study reveals that hydrogen charging profoundly alters the phase transformation behavior, mechanical properties, and electrical actuation performance of NiTi SMA wires. Results show that hydrogen charging reduces latent heat while elevating both martensitic and austenitic transformation temperatures. The observed increase in transformation temperatures is attributed to hydrogen-induced internal stress, which is explained using the Clausius-Clapeyron relationship. Besides, prolonged hydrogen charging reduces elongation, tensile strength, and recovery strain while increasing the critical detwinning stress and steepening the detwinning plateau. Under electrical actuation, hydrogen charging markedly decreases both actuation strain and fatigue life. Fractographic analysis confirms progressive embrittlement, which arises from multiple degradation mechanisms, including electrochemical corrosion, brittle hydride formation, and hydrogen interactions with cyclic martensitic transformations. Additionally, hydrogen charging accelerates the power-on response but slows the power-off recovery, a behavior linked to the combined effects of increased electrical resistance and reduced thermal conductivity. These findings provide critical insights into hydrogen-induced functional degradation, offering a foundation for enhancing the durability, reliability, and safety of SMA-based actuators in hydrogen-rich applications.