基于非晶-纳米晶复相结构形状记忆合金丝材的线性应变传感设计

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中图分类号：TQ424 文献标志码：A

文章编号：2096-2983（2025）04-0055-06

引文格式：，，，等．基于非晶-纳米晶复相结构形状记忆合金丝材的线性应变传感设计[J]．有色金属材料与工程， 2025，46（4）：5-60.DOI：10.13258/jcnkimme.20240415002.DENGGuomin，SHShudong，JQi，etal.Designflear strainsensing techniquebasedonamorphous-nanocrystalinecomplexstructure shape memory alloywire[J].NonferrousMetal Materials and Engineering， 2025， 46（4）： 55-60.

Abstract： Shape memory alloy （SMA） is a typical intelligent material with integrated sensing-actuatingcontrol capabilities. Leveraging its pseudoelasticity and strain-electrical resistance correlation， SMA demonstrates significant potential as a high-resolution strain sensor. However，the pseudoelasticity of SMA originates from martensitic phase transformation， whose first-order nature leads to phase transformation hysteresis and functional fatigue—both of which interfere with the strain-electrical resistance correlation，failing to meet the requirements for high-precision strain monitoring. Here，an amorphous-nanocrystalline multiphasestructureisconstructed via microstructural tailoring， transforming the typical abrupt first-order phase transformation into continuous behavior. This structure endows the alloy with broadened continuous phase transformation， ultra-low hysteresis，and enhanced functional fatigue stability. The results indicate that amorphous-nanocrystaline multiphase Ni-Ti shape memory alloy （SMA） wires exhibit a highly linear displacement-resistance relationship， excelent cyclic stability，and a long service life. When applied to the three-point bending strain testing ofconcrete， the SMA-based strain sensing system demonstrates a well-defined load-displacement-resistance signal response and reliable functional stability.

Keywords： shape memory alloy; amorphous-nanocrystalline; strain sensing; complex structure

形状记忆合金（shape memoryalloy，SMA）利用马氏体相变及逆相变过程中的晶体结构变化，在宏观上呈现巨大的可恢复应变的特性。（剩余7384字）