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首页> 外文期刊>Materials Science and Engineering >Effect of twinning on the orientation dependence of mechanical behaviour and fracture in single crystals of the equiatomic CoCrFeMnNi high-entropy alloy at 77K
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Effect of twinning on the orientation dependence of mechanical behaviour and fracture in single crystals of the equiatomic CoCrFeMnNi high-entropy alloy at 77K

机译：孪生在77K时赤素COCRFEMNI高熵合金单晶机械行为和骨折定向依赖性的影响

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摘要

The plastic flow behaviour of single crystals of the CoCrFeMnNi high-entropy alloy is shown to be greatly influenced by the twinning multiplicity on the stress-strain (σ(ε)) curves, the strain hardening coefficient Θ = dσ/ dε, plasticity and fracture. It is shown that a maximum effect of strain hardening is obtained during the onset of twinning in two systems in the [111]- and [144]-oriented crystals, while a transition to the development of twinning predominantly in one system simultaneously with slip, is accompanied by a decrease in strain hardening. At 77K in the [111]-, [123]- and [011]-oriented crystals, when twinning develops in one system with slip, the extension of the linear hardening stage and plasticity increase as a result of the suppression cross-slip and shifting the neck formation according to the Considere condition to higher stress levels. The development of deformation by twinning only in several systems and the suppression of the relaxation of local stresses during twin-twin intersection by slip or twinning, leads to the failure of quasi-cleavage in the [144]-oriented crystals at 77K, after 50% strain. With the development of twinning predominantly in one system and a high density of dislocations, the [111]-, [123]- and [011]-oriented crystals show ductile failure, since the stresses for neck formation according to the Considere condition are reached before the stresses for brittle fracture.
机译：COCRFEMNNI高熵合金的单晶的塑料流动行为被认为是在应力 - 应变（σ（ε））曲线上的孪生多重性影响，应变硬化系数θ=dσ/dε，可塑性和裂缝。结果表明，在[111] - 和[144]晶体中的两个系统中，在孪生中的发作期间获得了应变硬化的最大效果，同时同时在一个系统中过渡到孪生的开发，同时用滑动，伴随着菌株硬化的减少。在[111] - ，[123] - 和[011] - 和[011]晶体中，当孪生在一个系统中发育时，由于抑制交叉滑动和由于抑制交叉滑动而增加了线性固化阶段和可塑性的延伸根据指导条件转移颈部形成，以更高的应力水平。仅在几个系统中孪生的变形和抑制在双对双胞胎或孪生期间局部应力放松的变形，导致在77K之后[144] - 剂量的晶体中的准切割失效％ 拉紧。随着主要在一个系统中的孪生和高密度的脱位，[111] - ，[123] - 和 - [011]晶体显示出延展性衰竭，因为达到了颈部形成的应力在脆性骨折的应力之前。

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  • 来源
    《Materials Science and Engineering》 |2020年第may15期|139315.1-139315.14|共14页
  • 作者

    I.V. Kireeva; Yu.I. Chumlyakov; A.V. Vyrodova; Z.V. Pobedennaya; I. Karaman;

  • 作者单位

    National Research Tomsk State University Siberian Physical-Technical Institute of V.D. Kuznetsova Novosobornaya Sq. 1 Tomsk 634050 Russia;

    National Research Tomsk State University Siberian Physical-Technical Institute of V.D. Kuznetsova Novosobornaya Sq. 1 Tomsk 634050 Russia;

    National Research Tomsk State University Siberian Physical-Technical Institute of V.D. Kuznetsova Novosobornaya Sq. 1 Tomsk 634050 Russia;

    National Research Tomsk State University Siberian Physical-Technical Institute of V.D. Kuznetsova Novosobornaya Sq. 1 Tomsk 634050 Russia;

    Department of Materials Science and Engineering Texas A&M University College Station TX 77843 USA;

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  • 正文语种 eng
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  • 关键词

    CoCrFeMnNi High-entropy alloy; Single crystals; Tensile strain; Deformation twinning; Fracture;

    机译：COCRFEMNNI高熵合金;单晶;拉伸应变;变形孪生;断裂;

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