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A novel simulation of continuous dynamic recrystallization process for 2219 aluminium alloy using cellular automata technique

机译：2219铝合金采用蜂窝自动机技术对连续动态再结晶过程的新型模拟

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摘要

Based on the previous experiments, continuous dynamic recrystallization (CDRX) was determined to be the main softening mechanism of Al 2219 alloy during the thermal deformation process. The mechanism of microstruc-tural transformation for the CDRX process was firstly discussed, and the dislocation evolution model, subgrain growth nucleation model, low angle grain boundaries (LAGBs) migration model, and topological deformation model were established respectively. Using the probabilistic cellular automata technique, a two-step micro-structure formation method of initial equiaxed grains + local subgrains dispersion was proposed, which can simulate the initial microstructure at any processing state. Then, according to the proposed micro-mechanism and models of CDRX, a novel simulation approach of the CDRX process for Al 2219 alloy during thermal processing was established on the Matlab platform to predict the substructures evolution. The CA model was applied to extensively analyze the influence of deformation parameters and the transformation law of LAGBs. The results showed that high temperature, high strain, and low strain rate can effectively promote the development of continuous dynamic recrystallization, which is consistent with the experimental results.
机译：基于先前的实验，在热变形过程中，确定连续的动态再结晶（CDRX）是Al 2219合金的主要软化机理。首先讨论了CDRX过程的微动力变换机制，分别建立了脱位演化模型，粒子生长成核模型，低角度晶界（LAGBS）迁移模型和拓扑变形模型。采用概率蜂窝自动机技术，提出了一种初始等轴+局部叶子分散体的两步微结构形成方法，其可以在任何处理状态下模拟初始微观结构。然后，根据CDRX的提出的微机制和模型，在Matlab平台上建立了在热处理期间Al 2219合金的CDRX过程的新颖仿真方法，以预测子结构演变。应用CA模型广泛分析滞后变形参数的影响和滞后的变形法。结果表明，高温，高菌株和低应变率可有效促进连续动态再结晶的发展，这与实验结果一致。

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  • 来源
    《Materials Science and Engineering》 |2021年第20期|141256.1-141256.16|共16页
  • 作者

    Lei Liu; Yunxin Wu; Abdulrahaman Shuaibu Ahmad;

  • 作者单位

    Light Alloy Research Institute Central South University Changsha 410083 China State Key laboratory of High-Performance Complex Manufacturing Central South University Changsha 410083 China;

    Light Alloy Research Institute Central South University Changsha 410083 China State Key laboratory of High-Performance Complex Manufacturing Central South University Changsha 410083 China;

    State Key laboratory of High-Performance Complex Manufacturing Central South University Changsha 410083 China Department of Mechanical Engineering Kano University of Science and Technology Wudil Nigeria;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Al 2219 alloy; Continuous dynamic recrystallization; Low angle grain boundary; Misorientation angle; Cellular automata;

    机译：Al 2219合金;连续动态再结晶;低角度晶界;误导角;蜂窝自动机;

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