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Creep behavior and deformation feature of TiAl-Nb alloy with various states at high temperature

机译：TiAl-Nb合金在高温下的蠕变行为和变形特征

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摘要

By means of creep properties measurement and microstructure observation, an investigation has been made into the creep behaviors and deformation features of TiAl-Nb alloy with various states at high temperature. Results show that the microstructure of as-cast alloys consists mainly of lamellar γ/α_2 phases with various orientations, the boundaries located in between the ones consist of single y phase. The bigger plastic deformation of alloy during forging may refine the grains and increase the volume fraction of boundaries which consists of the fine block-like γ/＜α_2 phases with weaker strength. During creep, the bigger volume fraction of boundaries increase the probability of crack initiated and propagated along boundaries, which is thought to be the main reason of the forged alloy displaying a lower creep resistance. Compared to the forged alloy, the as-cast alloy displays a better creep resistance and longer creep life at high temperature. The deformation mechanism of as cast alloy during creep is significant amount of dislocations shearing into the lamellar γ/α_2 phases in the form of dislocations rows and rings. Compared with α_2-Ti_3Al phase, the γ phase possesses a weaker strength, therefore, the crack is easily initiated and propagated along the inclined boundaries. Wherein, the propagation of crack along the direction parallel to the lamellar γ/α_2 phases displays the smooth surface of fracture, while the tearing edges appear on the surface of fracture in one side of the inclined boundaries relative to lamellar γ/α_2 phases, which is attributed to the α_2-Ti_3Al phase with belter strength hindering the propagation of crack during creep.
机译：通过蠕变性能的测量和显微组织的观察，研究了高温下各种状态的TiAl-Nb合金的蠕变行为和变形特性。结果表明，铸态合金的显微组织主要由层状γ/α_2相组成，其取向各不相同，位于它们之间的边界仅由y相组成。合金在锻造过程中发生较大的塑性变形可能会细化晶粒并增加由细小块状γ/ ＜α_2相组成且强度较弱的晶界。在蠕变过程中，较大的边界体积分数会增加裂纹沿边界引发和扩展的可能性，这被认为是造成锻造合金的抗蠕变性降低的主要原因。与锻造合金相比，铸态合金在高温下具有更好的抗蠕变性和更长的蠕变寿命。铸态合金在蠕变过程中的变形机理是大量的位错以位错行和环的形式剪切进入层状γ/α_2相。与α_2-Ti_3Al相相比，γ相的强度较弱，因此裂纹易于沿倾斜边界发生扩展。其中，裂纹沿平行于层状γ/α_2相的方向扩展显示出断裂的光滑表面，而撕裂边缘出现在相对于层状γ/α_2相的倾斜边界一侧的断裂表面上，归因于α_2-Ti_3Al相，其束带强度阻碍了蠕变过程中裂纹的扩展。

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  • 来源
    《Materials Science and Engineering》 |2016年第10期|490-498|共9页
  • 作者

    Tian Sugui; Lv Xiaoxia; Yu Huichen; Wang Qi; Jiao Zehui; Sun Haofang;

  • 作者单位

    School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China;

    School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China;

    Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Science and Technology on Advanced High Temperature Structural Materials Laboratory, AVIC Beijing Institute of Aeronautical Materials, Beijing 100095, China;

    School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China;

    Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Science and Technology on Advanced High Temperature Structural Materials Laboratory, AVIC Beijing Institute of Aeronautical Materials, Beijing 100095, China;

    School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China;

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

    TiAl-Nb alloy; Microstructure; Creep; Deformation mechanism; Fracture feature;

    机译：TiAl-Nb合金;微观结构蠕变;变形机制;断裂特征;

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