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Modeling microstructural evolution during recrystallization of hot rolled high strength aluminum alloy 7050

机译:模拟热轧高强度铝合金7050的再结晶过程中的组织演变

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摘要

Understanding and predicting how microstructure evolves has become tremendously important to enable optimization of processing for improved properties. Modeling microstructural evolution during recrystallization and grain growth of polycrystalline material is gaining importance in the metals processing industry. Alloys can first be designed computationally and then their mechanical properties may be optimized by controlling their microstructural features. These features consist of grain size, particle/precipitate content, recrystallization fraction, and crystallographic texture. Moreover, given the complexity of industrial thermo-mechanical processes and the lack of comprehensive understanding of various annealing phenomena such as recrystallization, numerous efforts have concentrated on the improvement of computer simulation for recrystallization and grain growth.;The Monte Carlo Potts model was used to predict accurately the microstructural evolution during recrystallization taking into account the effect of stored energy around coarse particles. The spatial distribution of these coarse particles was specified as input for the simulation approach based on a statistical descriptor (pair correlation Function) for 2D section planes of AA7050 structure.;Finally, to prove the benefits of integrating the experiment into the simulation model and make the simulation more realistic an initial structure was obtained a real as-deformed microstructure by Electron Back scatter diffraction (EBSD) as well as the second phase particles distribution was determined by Backscattered Electrons (BSE).
机译:理解和预测微观结构如何演变已变得极为重要,这使得能够优化工艺以改善性能。在多晶材料的再结晶和晶粒生长过程中对微观结构演变进行建模在金属加工行业中变得越来越重要。合金可以首先进行计算设计,然后可以通过控制其微观结构特征来优化其机械性能。这些特征包括晶粒尺寸,颗粒/沉淀物含量,重结晶分数和晶体织构。此外,鉴于工业热机械过程的复杂性以及对各种退火现象(例如重结晶)的缺乏全面了解,许多工作都集中在改进重结晶和晶粒生长的计算机模拟上。考虑到粗颗粒周围储能的影响,可以准确地预测再结晶过程中的微观结构演变。这些粗颗粒的空间分布被指定为基于AA7050结构的二维截面的统计描述符(对相关函数)的仿真方法的输入。最后,证明了将实验集成到仿真模型中并获得通过电子背散射衍射(EBSD)可以更真实地模拟初始结构,获得真实的变形微观结构,并通过背向散射电子(BSE)确定第二相颗粒的分布。

著录项

  • 作者

    Adam, Khaled F. M.;

  • 作者单位

    Washington State University.;

  • 授予单位 Washington State University.;
  • 学科 Mechanical engineering.;Materials science.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 122 p.
  • 总页数 122
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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