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Texture evolution and microstructural thermal stability of as-extruded AA2099 during hot deformation

机译：挤压时AA2099热变形过程中的组织演变和微结构热稳定性

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摘要

Two thermal-mechanical regimes were selected to investigate the recrystallization process of an as-extruded AA2099 alloy. Specimens were deformed to strains of 0.4, 0.7 and 0.9 at 520 ℃ and strain rates of 0.001 s~(-1) and 0.1 s~(-1) respectively. Electron backscatter diffraction (EBSD) and electron channeling contrast (ECC) imaging were performed for all specimens to characterize their textures and micro-structures. The texture evolution is reflected by variation of deviation angle between <111> and extrusion directions, which appears to progressively approach ~35° (<110> //ED) due to lattice rotation in both regimes before ε=0.7. The reconstruction maps indicate that the nucleation of recrystallization is related to strain incompatibility near grain boundaries. The textures of specimens deformed to strain of 0.9 exhibit significant difference between the two regimes, i.e the <110>//ED fiber texture is comparatively weakened by recrystallization nuclei growth at the lower strain rate (0.001 s~(-1)). ECC images for specimen deformed at 0.001 s~(-1) reveal significant differences in size and volume fraction of Al_3Zr particles between recrystallized and unrecrystallized regions, suggesting remarkable influence of boundary migration on the thermal stability of Al_3Zr particles.
机译：选择了两种热机械机制来研究挤压后的AA2099合金的重结晶过程。试样在520℃下分别变形为0.4、0.7和0.9，应变速率分别为0.001 s〜（-1）和0.1 s〜（-1）。对所有样品进行了电子背散射衍射（EBSD）和电子通道对比度（ECC）成像，以表征其织构和微观结构。纹理演化由<111>和挤出方向之间的偏角变化反映，由于在ε= 0.7之前的两种状态下，由于晶格旋转，其似乎逐渐接近〜35°（<110> // ED）。重建图表明再结晶的成核与晶界附近的应变不相容有关。变形至0.9应变的试样的织构在两种情况下表现出显着差异，即<110> // ED纤维的织构在较低的应变速率（0.001 s〜（-1））下由于重结晶核的生长而相对减弱。在0.001 s〜（-1）变形的试样的ECC图像显示，再结晶区和未再结晶区之间的Al_3Zr粒子的尺寸和体积分数存在显着差异，这表明边界迁移对Al_3Zr粒子的热稳定性有显着影响。

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  • 来源
    《Materials Science and Engineering》 |2016年第15期|431-436|共6页
  • 作者

    Xusheng Yang; Linjiang Chai; Weijiu Huang; Yanlong Ma; Zhenhao Zhang;

  • 作者单位

    College of Materials Science and Engineering,Chongqing University, Chongqing 400044, China,College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China;

    College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China;

    College of Materials Science and Engineering,Chongqing University, Chongqing 400044, China,College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China;

    College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China;

    College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China;

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

    Al-Li alloy; Texture evolution; Microstructural thermal stability; Al_3Zr particles;

    机译：铝锂合金;纹理演变;微观结构的热稳定性;Al_3Zr颗粒;

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