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首页> 外文期刊>Materials Science and Engineering >The mechanism of grain refinement and plasticity enhancement by an improved thermomechanical treatment of 7055 Al alloy
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The mechanism of grain refinement and plasticity enhancement by an improved thermomechanical treatment of 7055 Al alloy

机译：通过改进7055铝合金的热机械处理细化晶粒并增强塑性的机制

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摘要

An improved double step hot rolling (DTR) processing was proposed to manufacture fine grained Al-Zn-Mg-Cu alloys based on pre-deformation, short-period annealing and final hot rolling. The DTR processing can produce high-quality rolling sheets with much finer recrystallized structures and significantly improved mechanical properties when compared with the conventional hot rolling (CTR). The main differences between the two TMTs (thermomechanical treatments) were investigated and the specific grain refining procedure of DTR was carefully characterized. The results show that the grain refinement is mainly proceeded via dislocation rearrangement and low angle grain boundaries transition, which can be attributed to the pinning effect of deformation induced precipitates (DIPs). Pre-deformation can accelerate the formation and spheroidization of fine DIPs which prohibit the migration of grain boundaries and the movement of dislocations. As a result, high density dislocation cells are formed and turn into polygon sub-grains after short-period intermediate annealing. During the final hot rolling, low angle grain boundaries gradually transferred into high angle grain boundaries which contributes to the final fine grained structures. The initiation and propagation of cracks were also delayed by grain refinement.%Grain refinement; Al-Zn-Mg-Cu; Microstructures; Mechanical properties; Thermomechanical treatment
机译：提出了一种改进的双步热轧（DTR）工艺，用于基于预变形，短时间退火和最终热轧来制造细晶粒的Al-Zn-Mg-Cu合金。与传统的热轧（CTR）相比，DTR工艺可以生产出高质量的轧制板，其重结晶组织要好得多，并且机械性能得到显着改善。研究了两种TMT（热机械处理）之间的主要区别，并仔细表征了DTR的特定晶粒细化程序。结果表明，晶粒细化主要通过位错重排和低角度晶界过渡进行，这可归因于形变诱发析出物（DIPs）的钉扎效应。预变形可以加速精细DIP的形成和球化，从而阻止晶界迁移和位错运动。结果，在短时期的中间退火之后，形成高密度的位错晶胞并变成多边形亚晶粒。在最终的热轧过程中，低角度的晶界逐渐转变为高角度的晶界，这有助于最终的细晶粒组织。晶粒细化也延迟了裂纹的产生和扩展。铝锌镁铜微观结构；机械性能热机械处理

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  • 来源
    《Materials Science and Engineering》 |2017年第15期|42-52|共11页
  • 作者

    Jinrong Zuo; Longgang Hou; Jintao Shi; Hua Cui; Linzhong Zhuang; Jishan Zhang;

  • 作者单位

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, 30 Xueyuan Road, Haitian District, Beijing 100083, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, 30 Xueyuan Road, Haitian District, Beijing 100083, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, 30 Xueyuan Road, Haitian District, Beijing 100083, China;

    School of Materials Science and Engineering, University of Science and Technology, Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, 30 Xueyuan Road, Haitian District, Beijing 100083, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, 30 Xueyuan Road, Haitian District, Beijing 100083, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Grain refinement; Al-Zn-Mg-Cu; Microstructures; Mechanical properties; Thermomechanical treatment;

    机译：晶粒细化;铝锌镁铜微观结构;机械性能热机械处理;

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