TY - THES

T1 - Additive Manufacturing of a β-Solidifying γ-Titanium Aluminide Alloy

AU - Bürstmayr, Richard

N1 - no embargo

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

KW - electron beam melting

KW - additive manufacturing

KW - titanium aluminides

KW - texture

KW - microstructure

KW - solidification

KW - Elektronenstrahlschmelzen

KW - Additive Fertigung

KW - Titanaluminide

KW - Textur

KW - Gefüge

KW - Erstarrung

M3 - Master's Thesis

ER -