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Deformation-induced γ → DI-α_2 phase transformation occurring in the twin-intersection region of TiAl alloys

机译：TiAl合金双相交区中发生形变引起的γ→DI-α_2相变

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摘要

Deformation-induced γ → DI-α_2 phase transformation was verified to occur in the twin-intersection region of a Ti-5Al-8Nb (at.%) alloy compressed at room temperature. High-resolution image observations of the deformation-induced DI-α_2 phase suggested that the orientation relationship between the DI-α_2 and γ phases remained the typical one: (0001)_(DI-α_2)//{111}γ, [1120]_(DI-α_2)//〈101]r The conversion of stacking sequence from ordered face-centered tetragonal to ordered nonequilibrium hexagonal close-packed structure was accomplished by the movement of a/6〈112] Shockley partial dislocations on every other {111}_γ, plane. Compositional analysis based on energy dispersive spectra revealed that the DI-α_2 phase had the same composition as the matrix γ phase. No compositional diffusion occurred because the plastic deformation was carried out at room temperature. The strong stress concentration in the intersection region was the major force to induce the γ → DI-α_2 phase transformation in the process of room-temperature compression.
机译：验证了在室温下压缩的Ti-5Al-8Nb（at。％）合金的双相交区域中发生了由变形引起的γ→DI-α_2相变。变形诱导的DI-α_2相的高分辨率图像观察表明，DI-α_2和γ相之间的取向关系仍然是典型的关系：（0001）_（DI-α_2）// {111}γ，[1120 ] _（DI-α_2）// <101] r通过a / 6 <112] Shockley部分位错的相互移动，将堆积顺序从有序的面心四角形转换为有序的非平衡六边形密堆积结构{111}_γ，飞机。基于能量色散谱的组成分析表明，DI-α_2相具有与基质γ相相同的组成。因为塑性变形是在室温下进行的，所以没有发生成分扩散。在室温压缩过程中，交会区域中的强应力集中是引起γ→DI-α_2相变的主要力量。

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  • 来源
    《Journal of Materials Research》 |2007年第9期|2416-2422|共7页
  • 作者

    C.L. Chen; W. Lu; L.L. He; H.Q. Ye;

  • 作者单位

    Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People's Republic of 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
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