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Volume 35 Issue 4
Aug 2021
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Chinese Journal of High Pressure Physics  > 2021  >  35(4): 040107.
LÜ Chao, ZHANG Xuping, WANG Guiji, LUO Binqiang, LUO Ning, WU Heng’an, TAN Fuli, ZHAO Jianheng, LIU Cangli, SUN Chengwei. Micro-Scale Response Characteristics of Ni52Ti48 Alloy under Shock Loading[J]. Chinese Journal of High Pressure Physics, 2021, 35(4): 040107. doi: 10.11858/gywlxb.20210769
Citation: LÜ Chao, ZHANG Xuping, WANG Guiji, LUO Binqiang, LUO Ning, WU Heng’an, TAN Fuli, ZHAO Jianheng, LIU Cangli, SUN Chengwei. Micro-Scale Response Characteristics of Ni52Ti48 Alloy under Shock Loading[J]. Chinese Journal of High Pressure Physics, 2021, 35(4): 040107. doi: 10.11858/gywlxb.20210769
shu

Micro-Scale Response Characteristics of Ni52Ti48 Alloy under Shock Loading

doi: 10.11858/gywlxb.20210769
  • 1.

    CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, Anhui, China

  • 2.

    Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

  • 3.

    State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China

  • 4.

    Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

  • 5.

    China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

  • Received Date: 11 Apr 2021
  • Rev Recd Date: 25 May 2021
    Abstract
  • Experiments and molecular dynamics simulations were carried out to understand the dynamic deformation behavior, microstructure evolution characteristics and mechanism of near equiatomic NiTi alloy at high pressures and high strain rates. In the experiments, the dynamic deformation characteristics of Ni52Ti48 alloy under shock compression and shock loading-unloading were studied by electromagnetically driven high-velocity flyer plate, momentum trapping and soft recovery experimental techniques based on high current pulse power device CQ-4. By means of X-ray diffraction and electron backscattered diffraction, the microstructure characteristics of Ni52Ti48 alloy were analyzed, the results show that there is no martensitic transformation in Ni52Ti48 alloy under shock compression and tension, and the main deformation mode is plastic deformation such as dislocation slip. Moreover, the microstructure evolution characteristics and deformation mechanism of Ni52Ti48 alloy under shock compression were studied by non-equilibrium molecular dynamics simulations, and the calculated results well reflect the microstructure characteristics observed in the experiment. Meanwhile, the spall strength of Ni52Ti48 alloy at different initial ambient temperatures was calculated, and the results show obvious unloading strain rate effect. The related work has deepened the understanding of the deformation behavior of Ni52Ti48 alloy at high pressures and high strain rates, and provided a reference for its safe service in extreme environment.

     

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