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High temperature deformation behavior of Ti-46Al-2Cr-4Nb-0.2Y alloy

机译：Ti-46Al-2Cr-4Nb-0.2Y合金的高温变形行为

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摘要

The hot deformation characteristics of cast and hot isostatically pressed Ti-46Al-2Cr-4Nb-0.2Y (at%) alloy in the temperature range of 1100-1250 ℃ and strain rate range of 0.01 -1.0 s~(-1) using hot compression tests were studied. The processing map of the alloy at true strain of 0.5 was also developed on the basis of the dynamic materials model (DMM). The experimental results show that the flow stress decreases significantly with increasing deformation temperature and decreasing strain rate. Using the kinetic rate equation the stress exponent n and the apparent activation energy of deformation Qwere determined as 4.47 and 400.4 kJ mol~(-1), respectively. The efficiency values of power dissipation of the domain at strain rate below 0.4 s~(-1) show that the dynamic recrystallization occurring of γ phase in the alloy is easier in the wide deformation temperature range (1100-1250℃) due to low stacking fault energy. The fraction of new recrystallized grains increased with increasing the hot deformation temperature at a given strain rate. With the increasing of strain rate, the uniformity of microstructure was decreased. The domain defined by the temperature range of 1200-1230 ℃ and the strain rate range of 0.01-0.05 s~(-1) which corresponds to a peak efficiency of about 60% is the optimal deformation condition of the alloy. Based on the optimal deformation conditions, a cylindrical sample was near isothermally forged. The microstructure and shape of pancake by forging was in good agreement with the prediction of processing map.
机译：铸造和热等静压Ti-46Al-2Cr-4Nb-0.2Y（at％）合金在1100-1250℃的温度范围和0.01 -1.0 s〜（-1）的应变速率范围内的热变形特性研究了压缩测试。在动态材料模型（DMM）的基础上，还绘制了合金在真实应变为0.5时的加工图。实验结果表明，流动应力随着变形温度的升高和应变速率的降低而显着降低。利用动力学速率方程，应力指数n和表观形变活化能Q分别确定为4.47和400.4 kJ mol〜（-1）。应变率低于0.4 s〜（-1）时畴的功率耗散效率值表明，合金的γ相在较宽的变形温度范围（1100-1250℃）较容易发生动态重结晶，这是因为其低堆积故障能量。在给定的应变速率下，新的再结晶晶粒的分数随热变形温度的升高而增加。随着应变率的增加，组织的均匀性降低。合金的最佳变形条件是在1200-1230℃的温度范围和0.01-0.05 s〜（-1）的应变速率范围内定义的范围，该范围对应于约60％的峰值效率。根据最佳变形条件，对圆柱样品进行了等温锻造。锻造煎饼的微观结构和形状与加工图的预测吻合良好。

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  • 来源
    《Materials Science and Engineering》 |2012年第30期|p.107-114|共8页
  • 作者

    Fantao Kong; Yuyong Chen; Deliang Zhang; Shuzhi Zhang;

  • 作者单位

    School of Materials Science and Engineering. Harbin Institute of Technology, Harbin 150001, PR China,State Key Laboratory of Advanced Welding Production Technology, Harbin 150001, PR China;

    School of Materials Science and Engineering. Harbin Institute of Technology, Harbin 150001, PR China;

    Waikato Centre for Advanced Materials, School of Engineering, The University of Waikato, Private Bag 3105, Hamilton, New Zealand;

    School of Materials Science and Engineering. Harbin Institute of Technology, Harbin 150001, PR China;

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

    intermetailics; TiAl alloys; deformation; processing map; forging; microstructure;

    机译：相互间TiAl合金;形变;加工图;锻造;微观结构;

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