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首页> 外文期刊>Materials Science and Engineering >Mechanical properties and microstructure of the Al_(0.3)CoCrFeNiTi_(0.3) high entropy alloy under dynamic compression
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Mechanical properties and microstructure of the Al_(0.3)CoCrFeNiTi_(0.3) high entropy alloy under dynamic compression

机译：动态压缩下AL_（0.3）COCRFENIT_（0.3）高熵合金的机械性能和微观结构

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摘要

In this work, the mechanical properties and corresponding microstructural evolution of the as-cast Al_(0.3)CoCr-FeNiTi_(0.3) high-entropy alloy (HEA) under quasi-static and dynamic compressive loadings were investigated. The HEA consisted of FCC/L1_2 + BCC/B2 mixed solutions exhibited a good combination of high strength and large ductility upon quasi-static loading, which is mainly due to the strengthening effect of coherent L1_2-nanoparticles. The HEA exhibited a significant positive strain rate effect, and its yield strength rised from 810 to 1181 MPa when the strain rate increased from 10~(-3) to 4700 s~(-3). Compared with the quasi-static condition, the density of stacking fault (SF) networks and immobile Lomer-Cottrell (L-C) locks were greater under dynamic loading. Furthermore, the deformation mode of the HEA was dominated by planar glide under high strain rate loading, and the dislocation substructure showed Taylor lattice, high-density dislocation walls and intersected micro-bands with the increase of strain. The dynamic Hall-Petch and microband-induced plasticity effects could be responsible for the excellent dynamic compressive properties. Fractographic observations indicated that the fracture of the HEA is controlled by the mixed ductile-brittle mechanism under dynamic compressive loading. An improved Johnson-Cook (J-C) constitutive model considering adiabatic temperature rise was employed to predict the plastic flow behavior of the HEA under dynamic conditions and the improved J-C model was in good agreement with the experimental results.
机译：在这项工作中，研究了在准静态和动态压缩载体下的AS铸造AL_（0.3）COCR-FENITI_（0.3）高熵合金（HEA）的机械性能和相应的微观结构演变。由FCC / L1_2 + BCC / B2混合溶液组成的HEA表现出在准静态负载上的高强度和大延展性的良好组合，这主要是由于相干L1_2-纳米颗粒的强化效果。 HEA表现出显着的阳性应变速率效应，当应变速率从10〜（3）增加到4700 s〜（3）时，其屈服强度从810到1181MPa上升。与准静态条件相比，在动态负载下，堆叠故障（SF）网络和固定Lomer-Cottrell（L-C）锁的密度更大。此外，HEA的变形模式在高应变速率载荷下通过平坦滑动来支配，并且位错子结构显示泰勒晶格，高密度位错壁和与菌株的增加相交的微带。动态霍尔 - PACH和麦片诱导的可塑性效应可能负责优异的动态压缩性能。 Fretographic观察结果表明，HEA的断裂由动态压缩负载下的混合延性脆性机制控制。考虑绝热温度升高的改进的约翰逊厨师（J-C）本构模型用于预测动态条件下HEA的塑性流动行为，改进的J-C型号与实验结果吻合良好。

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  • 来源
    《Materials Science and Engineering》 |2021年第22期|141147.1-141147.11|共11页
  • 作者

    Xianzhe Zhong; Qingming Zhang; Jing Xie; Mingze Wu; Fuqing Jiang; Yongming Yan; Zhiwei Wang;

  • 作者单位

    State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China;

    State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China;

    State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China;

    State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China;

    Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China;

    State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China;

    State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    High-entropy alloy; Dynamic loading; Mechanical properties; Dislocation structures; Constitutive model;

    机译：高熵合金;动态载荷;机械性能;错位结构;本构模型;

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