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首页> 外文期刊>Materials Science and Engineering >Annealing behavior of a cast Mg-Gd-Y-Zr alloy with necklace fine grains developed under hot deformation
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Annealing behavior of a cast Mg-Gd-Y-Zr alloy with necklace fine grains developed under hot deformation

机译：铸态细晶Mg-Gd-Y-Zr合金热变形后的退火行为

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摘要

The microstructure and texture development of a cast Mg-Gd-Y-Zr alloy during hot deformation and subsequent annealing were investigated by optical microscopy (OM) and electron backscattered diffraction (EBSD) technology. Initial microstructures with partially and fully developed new fine grains (NFGs), separately attended by continuous or interrupted hot forging, were various mixed grain structures composed of NFGs in necklace and retained coarse grains. It is shown that, during annealing, the development of grain size can be divided into three stages: i.e. an incubation of grain growth, a rapid coarsening and a normal grain growth. After a long time annealing of over 10~4 ks at 693 K, the average grain size for samples continuous compressed to ε=1.2 and those interrupted compressed to ε=1.6 were close. Moreover, orientations of such strain-induced fine grains were relatively randomly distributed, leading to a weakened basal texture, while the basal plane of retained coarse grains were perpendicular to the forging direction. Such texture even became weaker during subsequent annealing. The results show that the development of necklace NFGs during hot deformation can be effective for homogeneous grain refinement under subsequent annealing.
机译：利用光学显微镜（OM）和电子背散射衍射（EBSD）技术研究了铸态Mg-Gd-Y-Zr合金在热变形和随后的退火过程中的组织和组织发展。初始的具有部分和完全发展的新细晶粒（NFG）的微观组织，分别由连续或间断的热锻造加工而成，是由项链中的NFG组成并保留了粗晶粒的各种混合晶粒结构。结果表明，在退火过程中，晶粒尺寸的发展可分为三个阶段：晶粒长大的孵化，快速粗化和正常晶粒长大。在693 K下经过10〜4 ks的长时间退火后，连续压缩至ε= 1.2的样品和中断压缩至ε= 1.6的样品的平均晶粒尺寸接近。而且，这种由应变引起的细晶粒的取向是相对随机分布的，从而导致基层结构减弱，而保留的粗晶粒的基面垂直于锻造方向。这种质地甚至在随后的退火过程中变得更弱。结果表明，在热变形过程中项链NFG的发展对于随后退火过程中的均匀晶粒细化可能是有效的。

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  • 来源
    《Materials Science and Engineering》 |2017年第14期|280-288|共9页
  • 作者

    Yi Yang; Xuyue Yang; Zhenyu Xiao; Duxiu Zhang; Jun Wang; Taku Sakai;

  • 作者单位

    Educational Key Laboratory of Nonferrous Metal Materials Science and Engineering, School of Materials Science and Engineering, Central South University, Changsha 410083, China;

    Educational Key Laboratory of Nonferrous Metal Materials Science and Engineering, School of Materials Science and Engineering, Central South University, Changsha 410083, China,Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Central South University, Changsha 410083, China;

    Educational Key Laboratory of Nonferrous Metal Materials Science and Engineering, School of Materials Science and Engineering, Central South University, Changsha 410083, China;

    Educational Key Laboratory of Nonferrous Metal Materials Science and Engineering, School of Materials Science and Engineering, Central South University, Changsha 410083, China;

    Institute far Frontier Materials, Deakin University, Geelong, VIC 3216, Australia;

    UEC Tokyo (The University of Electro-Communications), Chofu, Tokyo 182-8585, Japan;

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

    Mg-Gd-Y-Zr alloy; New fine grains (NFGs); Hot deformation; Annealing; Grain growth; Texture;

    机译：Mg-Gd-Y-Zr合金;新细粒（NFG）;热变形;退火;谷物生长;质地;

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