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Atomistic simulation for configuration evolution and energetic calculation of crack in body-centered-cubic iron

机译:体心立方铁组织形态演化的原子模拟和裂纹能量计算

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摘要

The molecular dynamics method has been used to simulate mode I cracking in body-centered-cubic iron. Close attention has been paid to the process of the atomic configuration evolution of the cracks. The simulation shows that at low temperatures, partial dislocations are emitted before the initiation of crack propagation, subsequently forming the stacking faults or multilayer twins on {112} planes, and then brittle cleavage and extended dislocation nucleation are observed at the crack tip accompanied by twin extension. These results are in agreement with the experimental observation that twinning and fracture processes cooperate at low temperatures. Furthermore, an energetics analysis has been made on the deformation behavior observed at the crack tip. The effect of temperature on the fracture process is discussed. At the higher temperature, plastic deformation becomes easier, and crack blunting occurs. With increasing temperature, the fracture resistance increases, and the effect of the lattice trapping can be weakened by thermal activation.
机译:分子动力学方法已用于模拟体心立方铁中的I型开裂。密切关注裂纹的原子构型演变过程。模拟表明,在低温下,在裂纹扩展开始之前会散发部分位错,随后在{112}面上形成堆垛层错或多层孪晶,然后在裂纹尖端观察到脆性分裂和扩展的位错形核,并伴有孪晶。延期。这些结果与在低温下孪生和断裂过程协同作用的实验观察结果一致。此外,对在裂纹尖端观察到的变形行为进行了能量学分析。讨论了温度对断裂过程的影响。在较高的温度下,塑性变形变得更容易,并且出现裂纹钝化。随着温度的升高,抗断裂性增加,并且通过热活化可以削弱晶格俘获的效果。

著录项

  • 来源
    《Journal of Materials Research》 |2006年第10期|p.2542-2549|共8页
  • 作者

    Li-Xia Cao; Chong-Yu Wang;

  • 作者单位

    Central Iron and Steel Research Institute, Beijing 100081, People's Republic of China;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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