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首页> 外文期刊>Journal of Applied Physics >Strengthening due to Cr-rich precipitates in Fe-Cr alloys: Effect of temperature and precipitate composition
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Strengthening due to Cr-rich precipitates in Fe-Cr alloys: Effect of temperature and precipitate composition

机译：Fe-Cr合金中富Cr析出物引起的强化：温度和析出物组成的影响

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摘要

Molecular dynamics (MD) simulations were carried out to study the interaction between nanometric Cr precipitates and a 1/2 (111){110} edge dislocation (ED) in pure Fe and Fe-9 at. % Cr (Fe-9Cr) random alloy. The aim of this work is to estimate the variation in the pinning strength of the Cr precipitate as a function of temperature, its chemical composition and the matrix composition in which the precipitate is embedded. The dislocation was observed to shear Cr precipitates rather than by-pass via the formation of the Orowan loop, even though a pronounced screw dipole was emerged in the reactions with the precipitates of size larger than 4.5 nm. The screw arms of the formed dipole were not observed to climb thus no point defects were left inside the sheared precipitates, irrespective of simulation temperature. Both Cr solution and Cr precipitates, embedded in the Fe-9Cr matrix, were seen to contribute to the flow stress. The decrease in the flow stress with temperature in the alloy containing Cr precipitates is, therefore, related to the simultaneous change in the matrix friction stress, precipitate resistance, and dislocation flexibility. Critical stress estimated from MD simulations was seen to have a strong dependence on the precipitate composition. If the latter decreases from 95% down to 80%, the corresponding critical stress decreases almost as twice. The results presented here suggest a significant contribution to the flow stress due to the α- α' separation, at least for EDs. The obtained data can be used to validate and to parameterize dislocation dynamics models, where the temperature dependence of the obstacle strength is an essential input data.
机译：进行了分子动力学（MD）模拟，以研究纯Cr和Fe-9中纳米Cr沉淀物与1/2（111）{110}边缘位错（ED）之间的相互作用。 ％Cr（Fe-9Cr）无规合金。这项工作的目的是估计Cr沉淀物的钉扎强度随温度，其化学成分和其中嵌入沉淀物的基质成分的变化。观察到位错剪切了Cr沉淀物，而不是通过Orowan环的形成绕过了Cr，即使在反应中出现了明显的螺旋偶极子，且沉淀物的尺寸大于4.5 nm。没有观察到所形成的偶极子的螺旋臂爬升，因此与模拟温度无关，在剪切的沉淀物中没有留下点缺陷。可以看出，嵌入Fe-9Cr基体中的Cr溶液和Cr析出物均对流动应力有贡献。因此，含Cr析出物的合金中流动应力随温度的降低与基体摩擦应力，析出物抗性和位错挠性的同时变化有关。可以看出，通过MD模拟估算的临界应力对沉淀物成分有很强的依赖性。如果后者从95％降低到80％，则相应的临界应力几乎降低了两倍。此处给出的结果表明，至少对于EDs，由于α-α'分离，对流动应力有重要贡献。获得的数据可用于验证位错动力学模型并对其进行参数化，其中障碍物强度的温度依赖性是必不可少的输入数据。

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  • 来源
    《Journal of Applied Physics》 |2010年第6期|p.061806.1-061806.8|共8页
  • 作者

    D. Terentyev; S. M. Hafez Haghighat; R. Schaeublin;

  • 作者单位

    SCK·CEN, Institute of Nuclear Materials Science, Boeretang 200, B2400 Mol, Belgium;

    Ecole Polytechnique Federale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas, Association Euratom-Confideration Suisse, CH-5232 Villigen PSI, Switzerland;

    Ecole Polytechnique Federale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas, Association Euratom-Confideration Suisse, CH-5232 Villigen PSI, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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