Effect of <i>α</i><sub>2</sub> phase morphology on mechanical properties of titanium aluminide fabricated by electron beam melting

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  • Inoue Kana
    Graduate student, Graduate School of Systems Design, Tokyo Metropolitan University
  • Kakehi Koji
    Tokyo Metropolitan University

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  • 電子ビーム溶融法によって作製されたチタンアルミ合金の機械的特性に及ぼす<i>α</i><sub>2</sub>相の形態の影響
  • 電子ビーム溶融法によって作製されたチタンアルミ合金の機械的特性に及ぼすα₂相の形態の影響
  • デンシ ビーム ヨウユウホウ ニ ヨッテ サクセイ サレタ チタンアルミ ゴウキン ノ キカイテキ トクセイ ニ オヨボス a ₂ ソウ ノ ケイタイ ノ エイキョウ

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Abstract

<p>This study was conducted to reveal the relationship between the α2 phase morphology and the mechanical properties of Ti-48Al-2Cr-2Nb fabricated by electron beam melting (EBM). Tensile and creep tests were conducted for three kinds of samples: an as-HIP (hot isostatic pressing) sample and samples heat-treated at 1300°C and 1400°C after HIP. The microstructure observation in the as-HIP sample showed duplex-like structure/γ band layers formed by the EBM process. The HIP-1300 sample consisted of γ single grains, blocky α2 phase grains, and α2/γ lamellar grains with decomposed α2 lamellas. The tensile properties and creep resistance of the HIP-1300 sample were inferior to those of the as-HIP sample because the α2/γ interfaces of the blocky α2 phase were incoherent. The HIP-1400 sample, which had fully lamellar structure, was fractured in the elastic region, although this sampleʼs creep resistance and life were superior to those of the other samples due to the lamellar interfaces, coarse grains, and zig-zag grain boundaries.</p>

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