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Microstructural evolution and thermal stability of 1050 commercial pure aluminum processed by high-strain-rate deformation

机译:高应变率变形处理1050商用纯铝的组织演变和热稳定性

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摘要

Microstructural and property evolution of 1050 commercial pure aluminum subjected to high-strain-rate deformation (1.2-2.3 × 10~3 s~(-1)) by split Hopkinson pressure bar (SHPB) and subsequent annealing treatment were investigated. The as-deformed and their annealed samples at 373-523 K were characterized by transmission electron microscopy (TEM) and microhardness tests. TEM observations reveal that the as-deformed sample is mainly composed of a lamellar structure, whose transverse/longitudinal average subgrain/cell sizes are 293 and 694 nm, respectively. The initial coarse grains are refined significantly. The initial lamellar grain structures are subdivided into pancake-shaped subgrains due to a gradual transition by triple junction motion at 473 K, and then a dramatic microstructural coarsening is observed at 523 K. It is suggested that annealing behavior of this dynamic loading structure is better considered as a continuous process of grain coarsening or continuous recovery.
机译:研究了使用霍普金森压力棒(SHPB)进行高应变率变形(1.2-2.3×10〜3 s〜(-1))的1050商用纯铝的组织和性能演变,以及随后的退火处理。通过透射电子显微镜(TEM)和显微硬度测试对形变及其退火后的373-523 K样品进行表征。 TEM观察表明,变形后的样品主要由层状结构组成,其横向/纵向平均亚晶粒/晶胞大小分别为293和694 nm。初始粗晶粒被显着细化。最初的层状晶粒结构由于在473 K处通过三结点运动逐渐过渡而细分为薄饼状的子晶粒,然后在523 K处观察到剧烈的微观组织粗化。这表明该动态加载结构的退火行为更好被认为是晶粒粗化或连续恢复的连续过程。

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  • 来源
    《Journal of Materials Research》 |2015年第22期|3502-3509|共8页
  • 作者单位

    School of Material Science and Engineering, Central South University, Changsha 410083, China, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China, State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China, Key Laboratory of Ministry of Education for Nonferrous Metal Materials Science and Engineering, Central South University, Changsha 410083, China;

    School of Material Science and Engineering, Central South University, Changsha 410083, China;

    Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China;

    Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China;

    State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;

    State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, 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);
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  • 正文语种 eng
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