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<p>The doping of multilayer graphene (MLG) was investigated in this study to optimize the mechanical properties, elastocaloric effect and cyclic stability of Ni-Co-Mn-Ti alloys. The formation energies of Ni<sub>6</sub>Co<sub>2</sub>Mn<sub>6</sub>Ti<sub>2</sub> and Ni<sub>6</sub>Co<sub>2</sub>Mn<sub>6</sub>Ti<sub>2</sub>C<sub>1</sub> alloys were calculated using first-principles methods. It was revealed that the introduction of C(MLG) significantly reduced the formation energy, thereby enhancing the stability of the crystal structure. The microstructure, martensitic transformation, crystal structure, mechanical properties, elastocaloric performance and cyclic stability of MLG<sub><i>x</i></sub>/(Ni<sub>36</sub>Co<sub>14</sub>Mn<sub>35</sub>Ti<sub>15</sub>)<sub>100-<i>x</i></sub>(<i>x</i> = 0, 0.3, 0.6, 0.9, 1.5) alloys were systematically investigated. It was found that the doping of MLG induced the formation of black particulate precipitates within the alloy. These precipitates altered the composition of the alloy matrix and led to an increase in the phase transformation temperature. The incorporation of MLG further facilitated the transition of the alloy's crystal structure from an L2₁ cubic austenite phase to a 10&#xa0;M martensitic phase. Moreover, both the mechanical strength and the elastocaloric properties were significantly enhanced by MLG doping. The compressive fracture stress and strain were observed to increase progressively with increasing MLG content. Specifically, the MLG<sub>1.5</sub>/(Ni<sub>36</sub>Co<sub>14</sub>Mn<sub>35</sub>Ti<sub>15</sub>)<sub>98.5</sub> alloy achieved a compressive fracture stress of 1005&#xa0;MPa and a compressive fracture strain of 10.3% at 293&#xa0;K. Furthermore, the alloy with 0.6 at.% MLG achieved a <i>ΔT</i><sub><i>ad</i></sub> of -4.32&#xa0;K under a compressive stress of 400&#xa0;MPa and demonstrated superior cyclic stability with 800 cycles under a stress of 300&#xa0;MPa.</p>

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Multilayer graphene-enhanced Ni36Co14Mn35Ti15 alloys: A study on mechanical properties, elastocaloric effect and cycling stability

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • Xin Guo,
  • Xiaoguo Gao,
  • Yangrui Xu,
  • Li Gao,
  • Zhenhua Chu,
  • Jingxiang Xu,
  • Yan Feng

摘要

The doping of multilayer graphene (MLG) was investigated in this study to optimize the mechanical properties, elastocaloric effect and cyclic stability of Ni-Co-Mn-Ti alloys. The formation energies of Ni6Co2Mn6Ti2 and Ni6Co2Mn6Ti2C1 alloys were calculated using first-principles methods. It was revealed that the introduction of C(MLG) significantly reduced the formation energy, thereby enhancing the stability of the crystal structure. The microstructure, martensitic transformation, crystal structure, mechanical properties, elastocaloric performance and cyclic stability of MLGx/(Ni36Co14Mn35Ti15)100-x(x = 0, 0.3, 0.6, 0.9, 1.5) alloys were systematically investigated. It was found that the doping of MLG induced the formation of black particulate precipitates within the alloy. These precipitates altered the composition of the alloy matrix and led to an increase in the phase transformation temperature. The incorporation of MLG further facilitated the transition of the alloy's crystal structure from an L2₁ cubic austenite phase to a 10 M martensitic phase. Moreover, both the mechanical strength and the elastocaloric properties were significantly enhanced by MLG doping. The compressive fracture stress and strain were observed to increase progressively with increasing MLG content. Specifically, the MLG1.5/(Ni36Co14Mn35Ti15)98.5 alloy achieved a compressive fracture stress of 1005 MPa and a compressive fracture strain of 10.3% at 293 K. Furthermore, the alloy with 0.6 at.% MLG achieved a ΔTad of -4.32 K under a compressive stress of 400 MPa and demonstrated superior cyclic stability with 800 cycles under a stress of 300 MPa.