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<p>High entropy shape memory alloys (HESMAs) of (Ti<sub>30+x</sub>Zr<sub>20-x</sub>Ni<sub>35</sub>Cu<sub>15</sub>)<sub>99</sub>Y<sub>1</sub> (x = 0, 5, 10, at.%) and (Ti<sub>30</sub>Zr<sub>20</sub>Ni<sub>35+x</sub>Cu<sub>15-x</sub>)<sub>99</sub>Y<sub>1</sub> (x = 0, 5, 9, at.%) were prepared using vacuum arc melting. The effects of replacing Zr with Ti and Cu with Ni, as well as loading conditions, on the microstructure, mechanical properties, superelasticity, and stability of the HESMAs were studied using OM, SEM,TEM, and room-temperature cyclic compression tests. The results indicate that the low-cost as-cast (TiZrNiCu)<sub>99</sub>Y<sub>1</sub> HESMAs achieved excellent mechanical properties (compressive strength of 2572&#xa0;MPa and a fracture strain of 30.2%) and superelasticity, thus possessing a good combination of output work and recoverable strain. The excellent performances are attributed to dual granular phase strengthening and dendrite refinement caused by changes in alloy composition, and the lattice distortion effect of high-entropy alloys (HEA). In the cyclic compression process with a pre-strain of 2% to 15%, the maximum applied stress and output work reach 2042&#xa0;MPa and 182.7&#xa0;J/cm<sup>3</sup>, respectively, and the maximum recoverable strain and superelastic strain reach 9.23% and 5.55%, respectively. In cyclic compression with a fixed pre-strain of 6%, all HESMAs achieve a 100% recovery rate after 1 to 3 cycles, exhibiting good stability.</p>

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Low Cost (TiZrNiCu)99Y1 High Entropy Shape Memory Alloys with Excellent Combination of High Compressive Stress and Recoverable Strain

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Xiuqun Li,
  • Guangwei Zhao,
  • Haifeng Zou,
  • Dong Fang,
  • Caihua Huang,
  • Jin Lu,
  • Xicong Ye,
  • Hongmei Li

摘要

High entropy shape memory alloys (HESMAs) of (Ti30+xZr20-xNi35Cu15)99Y1 (x = 0, 5, 10, at.%) and (Ti30Zr20Ni35+xCu15-x)99Y1 (x = 0, 5, 9, at.%) were prepared using vacuum arc melting. The effects of replacing Zr with Ti and Cu with Ni, as well as loading conditions, on the microstructure, mechanical properties, superelasticity, and stability of the HESMAs were studied using OM, SEM,TEM, and room-temperature cyclic compression tests. The results indicate that the low-cost as-cast (TiZrNiCu)99Y1 HESMAs achieved excellent mechanical properties (compressive strength of 2572 MPa and a fracture strain of 30.2%) and superelasticity, thus possessing a good combination of output work and recoverable strain. The excellent performances are attributed to dual granular phase strengthening and dendrite refinement caused by changes in alloy composition, and the lattice distortion effect of high-entropy alloys (HEA). In the cyclic compression process with a pre-strain of 2% to 15%, the maximum applied stress and output work reach 2042 MPa and 182.7 J/cm3, respectively, and the maximum recoverable strain and superelastic strain reach 9.23% and 5.55%, respectively. In cyclic compression with a fixed pre-strain of 6%, all HESMAs achieve a 100% recovery rate after 1 to 3 cycles, exhibiting good stability.