Formation of Oriented Lamellar Colonies in a TiAlMn Alloy Produced by a Reactive Sintering

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  • Suzuki Tetsuya
    Department of Materials Science, Faculty of Engineering, Ibaraki University
  • Fukutomi Hiroshi
    Department of Mechanical Engineering and Materials Science, Faculty of Engineering, Yokohama National University
  • Tomota Yo
    Department of Materials Science, Faculty of Engineering, Ibaraki University
  • Tsujimoto Tokuzou
    National Research Institute for Metals

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The oriented lamellar colonies whose lamellar interfaces are parallel to the extrusion direction are formed by the heavy extrusion and reactive sintering of a titanium and Al-3.6 at%Mn alloy powder mixture, i.e., Ti-43.4 at%Al-1.6 at%Mn alloy. The formation process of the microstructure including texture evolution is investigated. As a result, it is concluded that the origin of the oriented lamellar colonies is the ⟨10\bar10⟩ fiber texture of the extruded titanium; the deformation texture of titanium is inherited by ternary α phase (α-TiAlMn) at an elevated temperature from which the oriented lamellar structure is formed through the precipitation of γ plates during cooling. Quantitative texture analyses for α and α2 phases have revealed that α grains with the deformation texture replace γ grains without changing their texture during the phase transition stage from α+γ to α on heating. On the other hand, the ⟨111⟩+⟨100⟩ fiber texture of the deformed aluminum alloy powder is inherited by γ on heating, but finally disappears at an α+γ⁄α transition temperature. Hence, an important factor of the oriented lamellar arrangement is to control the texture of α at an elevated temperature. The conditions to obtain such a favorable α texture is discussed.

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