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首页> 外文期刊>Materials Science and Engineering >Strain rate effect on the tension and compression stress-state asymmetry for electron beam additive manufactured Ti6A14V
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Strain rate effect on the tension and compression stress-state asymmetry for electron beam additive manufactured Ti6A14V

机译：应变速率对电子束添加剂制造的Ti6A14V的拉伸和压缩应力状态不对称的影响

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摘要

The present experimental investigation lays the groundwork for coupling the plastic flow stresses of an Additive Manufactured (AM) Ti6A14V with the corresponding strain hardening rate responses and fracture morphologies for this material at varying strain rates and stress states for the first time. The macroscopic response was obtained under different stress states (uniaxial tension and compression) and deformation rates (ranging from quasi-static at 0.001 s~(-1) to the high rate domain at 1500 s~(-1)) to elucidate the tension-compression asymmetry and strain rate dependence of the material. The results identified that, (a) compressive yield strengths are higher than their tensile counterparts and (b) the strength differential effect is more prominent under high strain rates. The mechanical behavior is explained in terms of deformation mechanisms reasoned from close inspection of strain hardening rate curves. Dislocation glide and mechanical twinning contribution as dominant plastic units were identified in stages and their relation with deformation mode and rate was established. Based on fractography analyses of the tensile samples, a rate dependence showed a shift from classic cup-cone fracture at quasi-static rates to fracture along the shear plane at high strain rates. The high strain rate compression samples also show an interesting fracture morphology with high speed video capturing adiabatic shear localization.
机译：本实验研究首次为将增材制造的（AM）Ti6A14V的塑性流动应力与该材料在不同的应变速率和应力状态下的对应的应变硬化速率响应和断裂形态进行耦合奠定了基础。在不同的应力状态（单轴拉伸和压缩）和变形速率（从0.001 s〜（-1）的准静态到1500 s〜（-1）的高速率域）下获得宏观响应，以阐明张力材料的压缩不对称性和应变率依赖性。结果表明，（a）抗压屈服强度高于抗拉屈服强度；（b）在高应变速率下，强度差异效应更为突出。通过仔细检查应变硬化速率曲线得出的变形机理来解释机械行为。分阶段确定了滑移位错和机械孪生为主要塑性单元，并确定了它们与变形模式和速率的关系。基于拉伸样品的分形分析，速率相关性显示从准静态速率下的经典杯形圆锥形断裂转变为高应变速率下沿剪切面的断裂。高应变率压缩样品还显示出有趣的断裂形态，并通过高速视频捕获了绝热剪切定位。

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  • 来源
    《Materials Science and Engineering》 |2018年第24期|125-133|共9页
  • 作者

    Omar L. Rodriguez; Paul G. Allison; Wilburn R. Whittington; Haitham El Kadiri; Oscar G. Rivera; Mark E. Barkey;

  • 作者单位

    NASA Marshall Space Flight Center, Materials and Processes Laboratory, Huntsville, AL 35812, USA;

    The University of Alabama, Department of Mechanical Engineering, Tuscaloosa, AL 35487, USA;

    Mississippi State University, Department of Mechanical Engineering, Starkville, MS 39762, USA;

    Mississippi State University, Department of Mechanical Engineering, Starkville, MS 39762, USA;

    Sikorsky Aircraft Corporation, Stratford, CT 06614, USA;

    The University of Alabama, Department of Aerospace Engineering, Tuscaloosa, AL 35487, USA;

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