Effect of Equiaxed γ-phase Grains on High-temperature Bending Deformation Behavior of Annealed Ti-47 at. %Al Intermetallic Compound

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  • Kishi Yoichi
    Advanced Materials Science Research & Development Center, Kanazawa Institute of Technology
  • Yajima Zenjiro
    Advanced Materials Science Research & Development Center, Kanazawa Institute of Technology
  • Shimizu Ken’ichi
    Advanced Materials Science Research & Development Center, Kanazawa Institute of Technology
  • Morii Koichi
    Daido Steel Co. , LTD.

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  • 熱処理したTi-47at. %Al金属間化合物の高温曲げ変形挙動に及ぼすγ相等軸粒の影響
  • ネツ ショリ シタ Ti 47at Al キンゾク カン カゴウブツ ノ コウオン マゲ ヘンケイ キョドウ ニ オヨボス ガンマソウ トウ ジクリュウ ノ エイキョウ

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Abstract

  Bending test of an annealed Ti-47 at. % Al intermetallic compound with a duplex structure consisting of γ-α2 two-phases lamellar and eqiaxed γ-phase grains was carried out at 973 K. Fracture surfaces and internal deformation structure were observed under a scanning electron microscope (SEM) and transmission electron microscope (TEM), respectively. SEM observations revealed grain boundary fracture of the equiaxed γ-phase grains. TEM observations of the internal microstructure revealed comparatively long deformation twins in the initial stage of plastic deformation, and these twins were observed along the direction of about 45 degrees to the loading axis. New deformation twins, which were short and formed among the initially formed long deformation twins, were observed in the final stage of the plastic deformation. Based on the SEM and TEM observations, the bending fracture mechanism of the annealed Ti-Al compound at 973 K was reviewed.

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