Additive Manufacturing of a β-Solidifying γ-Titanium Aluminide Alloy

Richard Bürstmayr

Research output: ThesisMaster's Thesis

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Abstract

Cylindrical specimens of the β-solidifying intermetallic titanium aluminide alloy TNM were produced by powder metallurgy using the additive manufacturing process of electron beam melting (EBM). These samples were manufactured with a constant line energy but different building directions (0°, 45°, 90°). Due to the solidification via the cubic body-centered β-phase a texture in the direction of the heat flow could be observed. The microstructure also changed depending on the building direction, which was also shown by the resulting creep and tensile properties. Furthermore, differences in the chemical composition have occurred between the powder and the as-EBM material. The Al-concentration was significantly lower after the EBM process. The methods used in this master thesis were optical and electron microscopy, differential scanning calorimetry, X-ray diffraction, electron backscatter diffraction and energy dispersive X-ray spectroscopy as well as tensile and creep tests at various temperatures.
Translated title of the contributionAdditive Fertigung einer β-erstarrenden γ-Titanaluminid Legierung
Original languageEnglish
QualificationDipl.-Ing.
Awarding Institution
  • Montanuniversität
Supervisors/Advisors
  • Mayer, Svea, Co-Supervisor (internal)
  • Clemens, Helmut, Supervisor (internal)
Award date29 Jun 2018
Publication statusPublished - 2018

Bibliographical note

no embargo

Keywords

  • electron beam melting
  • additive manufacturing
  • titanium aluminides
  • texture
  • microstructure
  • solidification

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