Effect of Cooling Rate on Powder Characteristics and Microstructural Evolution of Gas Atomized β-Solidifying γ-TiAl Alloy Powder

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  • Park Sung-Hyun
    Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University
  • Ozasa Ryosuke
    Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University Anisotropic Design & Additive Manufacturing Research Center, Osaka University
  • Gokcekaya Ozkan
    Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University Anisotropic Design & Additive Manufacturing Research Center, Osaka University
  • Cho Ken
    Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University Anisotropic Design & Additive Manufacturing Research Center, Osaka University
  • Yasuda Hiroyuki Y.
    Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University Anisotropic Design & Additive Manufacturing Research Center, Osaka University
  • Oh Myung-Hoon
    School of Materials Science and Engineering, Kumoh National Institute of Technology (KIT)
  • Kim Young-Won
    Gamteck LLC
  • Nakano Takayoshi
    Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University Anisotropic Design & Additive Manufacturing Research Center, Osaka University

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Abstract

<p>The gas atomization is a production technique of a metallic powder. In this study, the β-solidifying Ti–44Al–6Nb–1.2Cr alloy powder fabricated by gas-atomization was investigated regarding the evolving shape, phase constitution, and chemical distribution as a result of the high solidification rate. The powder showed a spherical shape regardless of its size, indicating no relation of solidification rate to powder shape. However, the small powder (D50 = 36.0 µm) showed less segregation and was composed of β and α2 dual phases. Whereas, the large powder (D50 = 78.7 µm) is relatively high segregation and composed of almost a single α2 phase because of the difference in the cooling rates. The findings obtained here demonstrated the understanding of phase transformation during the rapid solidification and continuous microstructural evolution process in the β-solidifying alloy.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 65 (2), 199-204, 2024-02-01

    The Japan Institute of Metals and Materials

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