Effect of Loading Frequency on the Interactions Among Phase Transformation, Plasticity and Heat Transfer in Cyclic Compression of NiTi Shape Memory Alloys
ZHANG Kuo1, LI Mingpeng2, ZHOU Guoan1, ZHANG Lingyun3,*
1 Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong 999077, China 2 School of Civil Engineering, Wuhan University, Wuhan 430000, China 3 School of Intelligent Manufacturing, Guangdong Eco-engineering Polytechnic, Guangzhou 510000, China
Abstract: Displacement-controlled cyclic compressive responses of polycrystalline super-elastic NiTi shape memory alloyswere investigated at a maximum strain of 4.2% and over frequency ranging from 0.000 7 Hz to 50 Hz in stagnant air. The study focused on the interactions among three mechanisms:phase transformation (PT), plastic flow of austenite phase and heat transfer. Temperature oscillations recorded by thermography technique were synchronized with the evolutions of stress-strain relations. It is found that for a given strain, there is a critical frequency, below which the thermomechanical responses are dominated by the frequency dependent coupling between pure PT and heat transfer and above which the macroscopic plastic deformation of austenite phase gets involved in the transient stage of the cycling and interacts with PT and heat transfer. This finding provides an important reference for us to understand the performance of NiTi shape memory alloys under dynamic loading conditions.
张括, 李明鹏, 周国安, 张龄匀. 加载频率对镍钛形状记忆合金循环压缩过程中相变、塑性与传热相互作用的影响[J]. 材料导报, 2025, 39(10): 24060186-6.
ZHANG Kuo, LI Mingpeng, ZHOU Guoan, ZHANG Lingyun. Effect of Loading Frequency on the Interactions Among Phase Transformation, Plasticity and Heat Transfer in Cyclic Compression of NiTi Shape Memory Alloys. Materials Reports, 2025, 39(10): 24060186-6.
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2025, Vol. 39 
