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The mechanism for the serrated flow induced by Suzuki segregation in a Ni alloy

机译：用Ni合金中铃木偏析诱导的锯齿状流动的机制

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摘要

The occurrence of serrated flow has been well accepted as a prevailing deformation feature in Ni-based alloys during plastic deformation at intermediate temperatures, yet its microstructure origin remains poorly understood. Here, characteristics of dynamic strain aging (DSA) in a Ni alloy 230 are studied by tensile tests over a wide range of temperatures and strain rates. The activation energy, Q, of the DSA effect is calculated to be 104 kJ/mol for temperatures from 523 to 773 K, about 35%-50% of the activation energy for lattice diffusion of Cr, Co or Mo in Ni, indicating pipe diffusion to be the crucial mode for solute segregation. Enrichment of Cr and Co atoms at stacking faults investigated by the state-of-the-art energy dispersive X-ray (EDX) spectroscopy is found in the deformed samples at 773 K with the strain rate of 3 × 10~(-3) s~(-1), suggesting that dynamic interactions between dissociated dislocations and substitutional solute atoms, known as Suzuki segregation, is responsible for the DSA effect. Moreover, the calculated diffusion distances of solute atoms through bulk diffusion prove that the pipe diffusion along partial dislocation core is contributing to the tensile process.
机译：在中间温度下的塑性变形期间，在塑性变形期间，锯齿状流动的发生是很好的，作为Ni基合金中的主要变形特征，但其微观结构源仍然仍然差。这里，通过在宽范围的温度和应变速率范围内，通过拉伸试验研究Ni合金230中的动态应变老化（DSA）的特征。 DSA效应的激活能量Q为104kJ / mol，温度为523至773k，约35％-50％的晶格扩散在Ni中的晶格扩散，表示管道扩散为溶质偏析的关键模式。在773K的变形样品中发现在由现有的能量分散X射线（EDX）光谱中研究的堆叠故障中Cr和Co原子的富集在773k的变形样品中，其应变率为3×10〜（-3） S〜（-1），表明解离脱位和因子溶质原子之间的动态相互作用，称为Suzuki偏析，是对DSA效应的原因。此外，通过散装漫射的计算出的溶质原子的扩散距离证明了沿着部分位错核的管道扩散有助于拉伸过程。

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  • 来源
    《Materials Science and Engineering》 |2021年第13期|141575.1-141575.8|共8页
  • 作者

    Zhouwen Jiang; Lilong Zhu; Lianxu Yu; Baoan Sun; Yang Cao; Yonghao Zhao; Yong Zhang;

  • 作者单位

    Herbert Gleiter Institute of Nanoscience School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China;

    Institute for Advanced Studies in Precision Materials Yantai University Yantai 264005 China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China;

    Metalink International Co Ltd Nanjing 211153 China;

    Institute of Physics Chinese Academy of Sciences Beijing 100190 China;

    Nano and Heterogeneous Materials Center School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China;

    Nano and Heterogeneous Materials Center School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China;

    Herbert Gleiter Institute of Nanoscience School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Ni alloy; Stacking fault; Dynamic strain ageing; Segregation; Mechanical properties;

    机译：Ni合金;堆叠故障;动态应变老化;隔离;机械性能;

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